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BRL-CAD is a powerful cross-platform Open Source combinatorial Constructive Solid Geometry (CSG) solid modeling system that includes interactive 3D solid geometry editing, high-performance ray-tracing support for rendering and geometric analysis, network-distributed framebuffer support, image and signal-processing tools, path-tracing and photon mapping support for realistic image synthesis, a system performance analysis benchmark suite, an embedded scripting interface, and libraries for robust high-performance geometric representation and analysis.

Inkscape (an alternative to Corel Draw) is a vector graphics editor, convenient for creating both artistic and technical illustrations (including use as a general-purpose CAD program, which is also facilitated by the ease of sharing drawings). It is widely used to create illustrations, icons, logos, diagrams, maps, as well as web graphics.

It contains advanced tools for work, comparable to the capabilities of Adobe Illustrator, CorelDRAW and Xara Xtreme. You can read save images in many formats including SVG, AI, EPS, PDF, PS and PNG. Inkscape has a comprehensive set of tools, a simple interface, support for many languages, and is extensible with custom add-ons.

Blender is a complex 3D modeling, animation, rendering, post-processing, interactive creation and playback (games).
With its help, static pictures, animation, models for games, as well as interactive information content in the form of independent programs are created.
It is possible to automate the program using Python scripts. In particular, import and export to popular file formats, such as 3D Studio and Wavefront Obj, are implemented in the form of scripts.

Vym (View Your Mind) is a mind diagramming program. It is useful for organizing thoughts and working on structuring something.
A connection diagram (mind map, mindmap) is a color radial diagram with an image in the center, illustrating semantic and other connections between parts of scientific material.
For example, it can graphically illustrate the structure of a dissertation plan, a project plan, or the structure of government institutions in an area.
Communication diagrams have many applications in personal, family, educational, and business situations.
Opportunities include note-taking, brainstorming, summarizing, revising, and general clarification of thoughts.

BASIC-256 is an easy-to-use version of BASIC designed to teach children the basics of programming. Uses traditional commands such as gosub, for/next, and goto, making it easy for children to understand program flow. It has a built-in graphics mode that allows you to draw a picture on the screen in a few minutes, as well as a set of detailed and simple tutorials that explain programming principles with fun examples.

Alchemy is a drawing project aimed at exploring how we can draw, draw and create in new ways on computers.
Alchemy is not software for creating a finished piece of art, but a sketching environment that focuses on the absolute beginning stage of the creation process. Alchemy allows you to experiment and visually explore a wider range of ideas and possibilities.

Code::Blocks is a cross-platform Integrated Development Environment (IDE). It is based on a self-developed plugin framework allowing unlimited extensibility. Most of its functionality is already provided by plugins. Plugins included in the base package are:
* Compiler frontend to many free compilers
* Debugger frontend for GDB
* Source formatter (based on AStyle)
* Wizard to create new C++ classes
* Code-completion / symbols-browser (work in progress)
* Default MIME handler
* Wizard to create new Code::Blocks plugins
* To-do list
* Extensible wizard based on scripts
* Autosave (saves your work in the unfortunate case of a crash)

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.

IDLE is an Integrated Development Environment for Python.
IDLE is written using Tkinter and is therefore available on different operating systems.

Colobot (Colonize with Bots) is a game aimed at teaching programming through fun. You play the role of an astronaut traveling with robot assistants in search of a planet to colonize.
The game features real-time 3D graphics and the C++ and Java-like object-oriented language CBOT, which can be used to program the robots available in the game.