Open-source cross-platform player for (some) RPG Maker XP / VX / VX Ace games. A very heavily modified fork of mkxp. RGSS on steroids with a stupid name.

Legacy Ruby Game Universal (RGU) [Deprecated]

Web port of mkxp (FOSS RGSS implementation) using Emscripten

Native port of mkxp-z on Android

LiteRGSS is a little library that'll do some stuff the RGSS do with sprite, bitmap and so on but using SFML.

ModShot - Advanced OneShot (2016) game engine for modding with QoL features, based on mkxp-z fork.

A port of MKXP and its dependencies to Android

Universal Ruby Game Engine 通用Ruby游戏引擎 (URGE)

RGSS3 clone