Built an Android app to streamline the messaging web-apps I use to stay in touch with some contacts. I already refrained from installing those services' apps due to privacy concerns. https://gitlab.com/not_john/palpipe

This actually inspired me recently to create Pal Pipe for Android- https://gitlab.com/not_john/palpipe

Lua became pretty popular to use in other games for the purposes of scripting, but no surprises there I guess.

Lesser known- games using Havok Physics may have used Havok's MOPP (a bytecode and interpreter for partitioning and searching the geometry).

https://github.com/niftools/nifxml/wiki/Havok-MOPP-Data-form...