Some past works:

another-keyboard-builder: Automated keyboard plate CAD generator, web and CLI tool

MX_Alps_Hybrid: Accurate Cherry MX/Alps SKCM keyswitch library for KiCad

Voyager: Open-source mechanical keyboard PCB examples

Type-C.pretty: USB Type-C footprint library for KiCad

Unified-Daughterboard: Standardized USB-C to JST-SR daughterboard

A few keyboards and related things