Scribus is an application for professional visual layout of printed documents (newspapers, magazines, brochures, literature, etc.) capable of creating high-quality pages for any purpose - be it replication for printing or electronic distribution.
Scribus supports all the features of professional publishing systems, such as extensive capabilities for layout and pre-press preparation of text, the CMYK color model, Spot Colors, the ICC color output management system, and the creation of PDF files.
This is similar to AdobeInDesign or QuarkXPress.

An object-oriented dialect of the BASIC language, complemented by an integrated development environment and running on GNU/Linux and other UNIX-like operating systems.

It is a tool similar to Visual Basic in terms of developing Basic programs.

Gambas was conceived as an alternative for Microsoft Visual Basic developers who decided to switch to GNU/Linux

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.

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)

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.

KediCAD is a 2D analogue of AutoCAD.

This program has a simulation feature that allows you to make expected changes to general drawings.

KediCAD can also be used to create a drawing of the moment of inertial calculations and calculation of bends.

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

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.

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.

Educational software designed to make learning programming easy and fun.

Greenfoot is an integrated development environment using Java or Stride designed primarily for educational purposes at the high school and undergraduate level. This makes it easy to develop 2D graphics applications such as simulations and interactive games.