- Armory - an open-source 3D game engine with full Blender integration
- Blender Game Engine - Blender 2.79b and older includes the BGE
- Bluegriffon - Web and EPUB editor
- Cube - a landscape-style engine that pretends to be an indoor FPS engine
- Cube 2: Sauerbraten - a free multiplayer & singleplayer first person shooter, the successor of the Cube FPS
- Diffuse Merge Tool - graphical tool for merging and comparing files
- EDuke32 (src) - Duke Nukem 3D engine and editor; requires original files such as "DUKE3D.GRP"
- Enigma+LateralGM - Easily create games with a Game Maker-like user interface and the Enigma Development Environment and export to various other systems
- fldiff - graphical diff program
- FLUID - FLTK GUI designer
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Hard to find (maybe?) FLTK Widgets...
- FL_Table - a generic row/column widget to encapsulate rows and columns of any kind of FLTK widgets
- Gambas - Integrated Development Environment; a very close Visual Basic alternative
- Game Editor - 2D game creation software
- Geany - a fast and lightweight IDE using GTK+
- Glade - create or open user interface designs for GTK+ applications
- IDLE - Integrated Development Environment for Python
- Godot - free and open-source game creation software
- GZDoom - a family of enhanced ports of the Doom engine for running on modern operating systems
- KompoZer - create web pages
- MegaZeux - a simple game creation system (GCS)
- Netbeans - Quickly and easily develop desktop, mobile, and web applications with Java, JavaScript, HTML5, PHP, C/C++ and more
- Octave - a high-level interactive language for numerical computations
- OHRRPGCE - Official Hamster Republic Role Playing Game Construction Engine
- OpenMW - an open-source open-world RPG game engine that supports playing Morrowind
- Open RPG Maker - a free and open source 2D RPG creation utility, similar to the popular RPG Maker series
- Platinum Arts Sandbox - an open source easy to use standalone 3D Game Maker and 3D Game Design program currently based on the Cube 2 engine
- Page - a Python GUI generator
- Pygame - a cross-platform set of Python modules designed for writing video games
- QB64 - a QuickBasic IDE for QB64 and QB45, depending on scripts used
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- QBPAINT.BAS - a paint program that saves graphic in plain text for use with QB64; QB64 required to compile
- Reinteract - interactive Python shell
- Ren'Py - a visual novel engine
- Slade - it's a Doom editor (Debian Repo)
- DOOM Sounds Index - A list to help you figure out what sound item plays what when modding
- Tesseract - a first-person shooter game focused on instagib deathmatch and capture-the-flag gameplay as well as cooperative in-game map editing
- Twine - write interactive stories and presentations
- Urho3D - a free lightweight, cross-platform 2D and 3D game engine greatly inspired by OGRE and Horde3D
- wxGlade - a GUI designer written in Python
- zzt++ - a game creation system, inspired by Tim Sweeney's 1991 shareware hit ZZT
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- BASH - GNU Bourne-Again SHell
- cc65 - a complete cross development package for 65(C)02 systems
- first_nes - a template for creating NES games
- FreeBASIC - a free/open source (GPL), BASIC compiler for Microsoft Windows, DOS and Linux
- dialog - display dialog boxes from shell scripts
- gcc - the GNU Compiler Collection
- git - the stupid content tracker
- gracon - a collection of python scripts that convert data (mostly graphics) to SNES-related formats
- GW-BASIC - a dialect of the BASIC programming language developed by Microsoft from BASICA, originally for Compaq
- hexedit - view and edit files in hexadecimal or in ASCII
- HTML - Hypertext Markup Language
- ncurses - a library to help programmers create text-based user interfaces
- octave - a high-level interactive language for numerical computations
- parallel - run programs in parallel
- pcbasic - a free, cross-platform emulator for the GW-BASIC family of interpreters
- pure-bash-bible - a collection of pure bash alternatives to external processes
- python - an interpreted, interactive, object-oriented programming language
- qbasic - Pete's QB tutorial site
- shc - a generic shell script compiler
- yabasic - Yet Another Basic
- yad - display GTK+ dialogs in shell scripts
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