k/Apl info

• APL self hosted compiler https://news.ycombinator.com/item?id=13797797
• APL self hosted compiler screencast https://www.youtube.com/watch?v=gcUWTa16Jc0 
• q manual http://code.kx.com/q4m3/
• ok manual https://github.com/JohnEarnest/ok/blob/gh-pages/docs/Manual.md
• k main page http://kparc.com/
• kona https://github.com/kevinlawler/kona