This is some code and config shared by all of my keyboards. I use community layouts wherever possible, only writing keyboard-specific keymaps for boards without standard layout support. I derive my keymaps from two canonical ones (preferred for typing and gaming, respectively).
Split 3x6 + 3 thumb keys: Columnar-staggered split ergo layout, preferred for typing. Used on Crkbd.
60% Tsangan HHKB: Row-staggered layout, preferred for gaming. Used on ai03 Polaris, CannonKeys AN-C, CannonKeys Instant60.
60% ANSI split backspace/right-shift. Used on DZ60.
65% ANSI blocker split backspace. Used on KBDfans KBD67 hotswap.