This is a condensed list for personal bookkeeping. A better one is at GitHub.
Projects with an asterisk require more work.
Docs/Learning Material
Nial, K Wiki, Efficient Array Programming, ngn/k tutorial*
Language Tools
k-akoune, bqn-vscode, highlightjs-bqn
Esolangs, Code Golf, Others
Self-designed Esolang: Limn
Implementations: Zirconium, knight-apl, graphical-bf, Interpreters
Golf and Challenges: APLgolf, aoc, code-golf, random, code guessing