Rnote is a vector-based drawing app for sketching, handwritten notes and to annotate documents and pictures.Disclaimer: The file format is still unstable. It might change and break compatibility between versions.

Rnote

FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters. It is designed to fit a wide range of uses including product design, mechanical engineering, architecture and 3D printing.FreeCAD allows you to sketch geometry constrained 2D shapes and use them as a base to build other objects. It contains many components to adjust dimensions or extract design details from 3D models to create high quality production-ready drawings. it is a multiplatfom (Windows, Mac and Linux), highly customizable using the Python language. It reads and writes to many open file formats such as STEP, IGES, STL, SVG, DXF, OBJ, IFC, DAE and many others, making it possible to seamlessly integrate it into your workflow.FreeCAD includes a modern Finite Element Analysis (FEA) tools, experimental CFD, BIM, Geodata workbenches, a Path (CNC) workbench, a robot simulation module that allows you to study robot movements and many more, and a rich collection of plugins and macros installable directly from within the application.

FreeCAD

Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.Anyone who needs to remember things in their daily life can benefit from Anki. Since it is content-agnostic and supports images, audio, videos and scientific markup (via LaTeX), the possibilities are endless.Optional LaTeX support is provided by the TeX Live Flatpak extension org.freedesktop.Sdk.Extension.texlive//22.08.

Anki

Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets and nebulae, and has many other features including multiple panoramic landscapes, fog, light pollution simulation and a built-in scripting engine.Stellarium comes with a star catalogue of about 600 thousand stars and it is possible to download extra catalogues with up to 210 million stars.Stellarium has multiple sky cultures - see the constellations from the traditions of Polynesian, Inuit, Navajo, Korean, Lakota, Egyptian and Chinese astronomers, as well as the traditional Western constellations.It is also possible to visit other planets in the solar system - see what the sky looked like to the Apollo astronauts, or what the rings of Saturn looks like from Titan.

Stellarium

Discover Math with GeoGebra. Solve equations, graph functions, create constructions, analyze data, explore 3D math!

GeoGebra

QGIS is a user friendly Open Source Geographic Information System (GIS) licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It runs on Linux, Unix, Mac OSX, Windows and Android and supports numerous vector, raster, and database formats and functionalities.

QGIS Desktop

A Free and Open Source Geographic Information System

Ideas Grow on Trees.Xmind is a full-featured mind mapping and brainstorming app. Like a Swiss Army Knife for your brain, spark creativity and improve thinking skills. 100+ million installations on the planet.

Xmind (2022)

GCompris is a high quality educational software suite, including a large number of activities for children aged 2 to 10.Some of the activities are game orientated, but nonetheless still educational.Below you can find a list of categories with some of the activities available in that category.computer discovery: keyboard, mouse, different mouse gestures, ...arithmetic: table memory, enumeration, mirror image, balance the scale, change giving, ...science: the canal lock, color mixing, gravity concept, ...games: memory, connect 4, tic tac toe, sudoku, hanoi tower, ...reading: reading practice, ...other: learn to tell time, the braille system, maze, music instruments, ...Currently GCompris offers in excess of 100 activities and more are being developed. GCompris is free software, that means that you can adapt it to your own needs, improve it and, most importantly, share it with children everywhere.

GCompris

Multi-Activity Educational game for children 2 to 10

Thonny is a simple Python IDE with features useful for learning programming. It comes with a debugger which is able to visualize all the conceptual steps taken to run a Python program (executing statements, evaluating expressions, maintaining the call stack). There is a GUI for installing 3rd party packages and special mode for learning about references.See the homepage for more information, screenshots and a walk-through video.

Thonny

GNU Octave is a high-level interpreted language, primarily intended for numerical computations. It provides capabilities for the numerical solution of linear and nonlinear problems, and for performing other numerical experiments. It also provides extensive graphics capabilities for data visualization and manipulation. Octave is normally used through its interactive command line interface, but it can also be used to write non-interactive programs. The Octave language is quite similar to Matlab so that most programs are easily portable.Octave has extensive tools for solving common numerical linear algebra problems, finding the roots of nonlinear equations, integrating ordinary functions, manipulating polynomials, and integrating ordinary differential and differential-algebraic equations. It is easily extensible and customizable via user-defined functions written in Octave's own language, or using dynamically loaded modules written in C++, C, Fortran, or other languages.

GNU Octave

Interactive programming environment for numerical computations

Organic Maps is a free Android &amp; iOS offline maps app for travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by &lt;em&gt;MapsWithMe&lt;/em&gt; (&lt;em&gt;MapsMe&lt;/em&gt;) founders and our community. No ads, no tracking, no data collection, no crapware. Your donations and positive reviews motivate and inspire us, thanks ❤️!## FeaturesThe Linux version of Organic Maps has not reached feature parity with the Android and iPhone versions yet, and has not been optimized for mobile devices yet. Organic Maps is the ultimate companion app for travelers, tourists, hikers, and cyclists:## Why Organic?Organic Maps is pure and organic, made with love:Organic Maps app is free from trackers and other bad stuff:The application is verified by Exodus Privacy Project.Organic Maps doesn't request excessive permissions to spy on you.At Organic Maps, we believe that privacy is a fundamental human right:Reject surveillance - embrace your freedom. &lt;em&gt;Give Organic Maps a try!&lt;/em&gt;

Organic Maps

A free offline maps app for travelers, tourists, hikers, and cyclists based on top of crowd-sourced OpenStreetMap data and curated with love by MapsWithMe (Maps.Me) founders

Notesnook is a free (as in speech) &amp; open source note taking app focused on user privacy &amp; ease of use. To ensure zero knowledge principles, Notesnook encrypts everything on your device using XChaCha20-Poly1305 &amp; Argon2.Notesnook is our proof that privacy does not (always) have to come at the cost of convenience. Our goal is to provide users peace of mind &amp; 100% confidence that their notes are safe and secure. Our decision to go fully open source is one of the most crucial steps towards that.Notesnook is a user focused note taking tool meant to offer a fully end-to-end encrypted note taking experience for everyone. This includes the majority of our less tech savy users who just want to take notes without all the hassle.In short, Notesnook aims to offer a complete replacement for other insecure note taking tools like Evernote &amp; Notion. Because let's be honest, these tools offer great productivity but at a great cost to your privacy.

Notesnook

A fully open source & end-to-end encrypted note taking alternative to Evernote

OpenBoard is an open source cross-platform teaching software for interactive whiteboard designed primarily for use in schools and universities. It can be used both with interactive whiteboards or in a dual-screen setup with a pen-tablet display and a beamer.

OpenBoard

Interactive whiteboard for schools and universities

KStars is freely licensed, open source, cross-platform Astronomy Software by KDE.It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time. The display includes up to 100 million stars, 13,000 deep-sky objects,all 8 planets, the Sun and Moon, and thousands of comets, asteroids, supernovae, and satellites.For students and teachers, it supports adjustable simulation speeds in order to view phenomena that happen over long timescales, the KStars Astrocalculator to predict conjunctions, and many common astronomical calculations.For the amateur astronomer, it provides an observation planner, a sky calendar tool, and an FOV editor to calculate field of view of equipment and display them. Find out interesting objects in the "What's up Tonight" tool, plot altitude vs. time graphs for any object, print high-quality sky charts, and gain access to lots of information and resources to help you explore the universe!Included with KStars is Ekos astrophotography suite, a complete astrophotography solution that can control all INDI devices including numerous telescopes, CCDs, DSLRs, focusers, filters, and a lot more. Ekos supports highly accurate tracking using online and offline astrometry solver, autofocus and autoguiding capabilities, and capture of single or multiple images using the powerful built in sequence manager.Astronomical Catalogs:Default catalog consisting of stars to magnitude 8Extra catalogs consisting of 100 million stars to magnitude 16Downloadable catalogs including Messier Images, Abell Planetary Nebulae, Sharpless Catalog, Lynds Dark Nebula CatalogCorrections for precession, nutation and atmospheric refractionTools for retrieval of data from online databases

KStars

An unofficial desktop wrapper for the world’s most-used education webapp! Duolingo is the fun, free app for learning 35+ languages through quick, bite-sized lessons. Practice speaking, reading, listening, and writing to build your vocabulary and grammar skills.

DL: language lessons

Unofficial desktop client for the language-learning app Duolingo

Current weather, with information about temperature, pressure, wind speed and wind direction, sunrise and sunset. Know meteorologic predictions to next hours and days. Show awesome maps with all the information. Switch between some maps distributors. Now with System Tray Indicator, showing your location and forecast.Other features:Forecast for next 18 hoursForecast for next five daysChoose your units from metric, imperial or british systemsChoose your city with popup mapsWatch awesome maps with weather information

Meteo

Know the forecast of the next hours and days with data and maps

All the water has disappeared from your village and it's up to you to save the day! Go on an adventure to connect the water pipes and bring water back to your village. Solve puzzles and hack your way through 15 levels of fun and challenging islands. You may discover that you'll learn some things along the way...

Aqueducts

An immersive puzzle adventure game where you hack your way to saving the day!

With the Mendeley Reference Manager, you can easily organize and search your personal library, annotate documents and cite as you write. Import papers and other documents from your desktop, your existing libraries or websites with ease. Mendeley automatically captures information like authors, title and publisher, which makes organization and browsing easy.Over 6 million researchers trust Mendeley to share ideas, see what’s new in their field and discuss important developments. Discover new connections by searching for people on Mendeley and finding researchers with similar interests via Public Groups. You can also follow new people from suggestions in your Mendeley feed.

Mendeley

Mendeley is a free reference manager and an academic social network

LeoCAD is a CAD program for creating virtual LEGO models. It's available for free under the GNU Public License v2 and works on the Windows, Linux and macOS Operating Systems.

LeoCAD

Design virtual models you can build with LEGO bricks

A cross-platform libre handwritten notes app, available for Android, iOS, Linux, Windows, and macOS!

Saber: Handwritten Notes

A cross-platform libre handwritten notes app.

Picasso? Van Gogh? You can be any of them! Just let the artist inside you free. Transform images in your mind to beautiful paintings.

Paint

GoldenDict is a feature-rich dictionary lookup program, supporting multiple dictionary formats (StarDict/Babylon/Lingvo/Dictd/AARD/MDict/SDict) and online dictionaries, featuring perfect article rendering with the complete markup, illustrations and other content retained, and allowing you to type in words without any accents or correct case.

GoldenDict

Plots makes it easy to visualise mathematical formulae. In addition to basic arithmetic operations, it supports trigonometric, hyperbolic, exponential and logarithmic functions, as well as arbitrary sums and products. It can display polar equations, and both implicit and explicit Cartesian equations.Plots is designed to integrate well with the GNOME desktop and takes advantage of modern hardware using OpenGL.

Plots

Tux Paint is a free, award-winning drawing program for children ages 3 to 12. Tux Paint is used in schools around the world as a computer literacy drawing activity. It combines an easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who guides children as they use the program.Kids are presented with a blank canvas and a variety of drawing tools to help them be creative.

Tux Paint

Kalzium is a program that shows you the Periodic Table of Elements. You can use Kalzium to search for information about the elements or to learn facts about the periodic table. It provides an overview of the important data (like melting points, electron affinity, electron negativity, electron configuration, radii, mass, ionisation energy), an isotope table, and different colored views of the periodic table (separation of the different blocks, year simulator, temperature simulator). It contains tools to visualize the spectral lines of each element, a molecular weight calculator, a 3D molecule editor, and an equation solver for stoichiometric problems.

Kalzium

Marble is a virtual globe and world atlas — your swiss army knife for maps that you can use to learn more about the Earth and other planets.Explore the neighborhood with Marble's rich set of city and street level maps. Search for addresses and places of interest. Marble takes care of querying various search backends and presents their results in a unified view. Calculate pedestrian, bike and motorcar routes with ease — online and offline, with an arbitrary number of via points.Start exploring the world. View clouds and sun shadow, follow satellites and space stations and display their orbits, all updated in real-time. Travel back in time and learn about historic views of our planet using maps from past centuries. Earth is not enough? Marble also offers maps of the moon and other planets.

Marble

Gaia Sky is a real-time, 3D, astronomy visualisation software for desktop and VR that runs on Linux, Windows and macOS. It is developed in the framework of ESA's Gaia mission to chart about 1 billion stars of our Galaxy in the Gaia group of the Astronomisches Rechen-Institut (ZAH, Universität Heidelberg). Explore the Solar System, the Milky Way or even the most distant galaxies of the Universe.

Gaia Sky

Open Source 3D universe simulator for desktop and VR with support for more than a billion objects

Scrivano is a note-taking application aimed at those who prefer handwriting over typing. It offers a simple and easy to use interface to write down your thoughts and ideas. The app gives you an infinite vertical canvas (but limited horizontal space) without sacrificing the ability to easily export your notes in traditional printing formats (e.g. A2, A3, A4, etc...).Here is a summary of the most important features:4 different paper backgrounds to choose from: Plain, Lined, Grid or Dotted with customisable spacing and backgrounds.Grid Snapping: in Scrivano you can toggle the grid snapping feature so that your drawings will automatically snap to grid lines in the background. This is very useful to easily draw tables, diagrams and lines.Automatic filling of strokes: toggle the paint bucket in the toolbar to fill your drawing shapes and strokes.Stickers: save your frequently used symbols and diagrams, so you can easily drag and drop whenever you need them.Insert images: paste or drag and drop any image on the canvas to unleash your creativity!Offline saving: save your notes anywhere on your main drive, so you can manage them however you please.Laser: Scrivano offers a special laser tool to quickly draw over your notes. Incredibly useful when sharing your screen or presenting something!Annotate PDF files: You can import your PDF books, lecture slides, articles and documents to annotate them using Scrivano's built-in inking tools.NOTE: The flatpak version of the app runs in a sandbox environment and it can only read/write files from these folders: xdg-desktop, xdg-documents, xdg-download and xdg-pictures. If you want to circumvent this for more freedom, you can use Flatseal to override these restrictions.

Scrivano for Handwritten Notes

A note-taking application for those who prefer handwriting over typing.

Koodo Reader is an all-in-one ebook reader that can help you better manage and study your ebooks. It's free and open-source.Format support:Save your data to Dropbox or WebdavCustomize the source folder and synchronize among multiple devices using OneDrive, iCloud, Dropbox, etc.Single-column, two-column, or continuous scrolling layoutsText-to-speech, translation, progress slider, touch screen support, batch importAdd bookmarks, notes, highlights to your booksAdjust font size, font family, line-spacing, paragraph spacing, background color, text color, margins, and brightnessNight mode and theme colorText highlight, underline, boldness, italics and shadow

Koodo Reader

BibleTime is a completely free Bible study program, built for Linux, Windows, FreeBSD and Mac OS X. BibleTime contains over 400 free Bible texts, commentaries, dictionaries and books, provided by the Crosswire Bible Society.