I maintain ATTinyCore for all classic ATtiny parts, megaTinyCore for all new 0/1/2-series ATtiny and DxCore for DA/DB-series. github.com/SpenceKonde
http://drazzy.com/package_drazzy.com_index.json
ATtiny breakouts, mosfets, awesome prototyping board in my store http://tindie.com/stores/DrAzzy