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CTFs as you need them
PyCAPGE - Python Classic Adventure Point and Click Game Engine
TX Library is a tiny graphics library for Win32 written in C++.
Updated emulator of Forgotten Realms: Unlimited Adventures
A cross platform Lua based game engine
A synchronisation component for p5.js
An environment to develop games based on a rectangular board
Asphyre is a cross-platform framework for Delphi and FreePascal.
Lego Island 2 Game Editor
Processes dialogue text files exported by the Bethesda Softworks SDK
a game library to develop audio games
Library for creating turn-based games with simultaneous moves.
TurboSphere is an easy to learn and powerful JS based game engine.
Scriptable frontend for media applications.
Open source network game service
Pear3DEngine is a modern and modular 3D development framework
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
DiaT is a Textadventure
Cross-platform 2D game engine