Software library and tools for making the Tramway Drifting and Dungeon Exploration Simulator 2022 and similar applications. Similar to Quake, GoldSrc or Source engines, but it uses polygonal soup instead of BSPs and supports level streaming.
nCine is a cross-platform 2D game framework written in C++ with an emphasis on performance, but it is also scriptable in Lua for more flexibility. You can use it to create your games and tools or to learn and experiment with its source code.
A cross platform game engine that can be used to make simulations of any kind, ranging from simple prototypes to professional 2D and 3D games, simple physics or graphics demonstrations to robust, realistic simulations.
AllBinary Game Engine is a multi-platform game engine in Java. Entire game engine is also in 100% Kotlin. Supports: Android (Without native libraries in Java or Kotlin), HTML5, J2ME (MIDP), Windows Native (Avian), and J2SE (Java or Kotlin).
Easel lets you code multiplayer games without coding the multiplayer. Code like all your players are in one shared world, like a singleplayer game, and Easel does the rest.
Flickgame is a game-/story-/thing-making tool. You have sixteen frames, sixteen colors, a few brush sizes, and the means to link together frames via the color menu.