Callisto is a unique reverse polish notation programming language inspired by YSL-C3 and Forth. It offers a subset called CallistoScript for scripting languages like Lua, making it a versatile choice. Callisto supports targets including x86 real mode, x86_64 Linux, and Uxn. Building it requires a D compiler, and there are example programs available for experimentation. To delve deeper into Callisto, explore the documentation. Controversially, the implementation for Uxn is noted as broken. For support or discussion, join #callisto-lang on irc.libera.chat. This unconventional language is a fascinating option for developers looking for something different.
https://github.com/callisto-lang/compiler