Open-source:

Game programming

malvado - A game programming library with "DIV Game Studio"-style processes for Lua/Love2D

Machine learning & Natural Language processing

nlptools - A unix-inspired tools for Natural Language Processing

Web & Utilities

bpipe - Minimal & Simple Pipeline Engine for Python

bagent - Minimal & Simple Agent Engine for Python

Other

awesome-complexity - A curated list of amazingly awesome Complexity Science resources, courses and shiny things