avr-devices
There are 2 repositories under avr-devices topic.
SpenceKonde/DxCore
Arduino core for AVR DA, DB, DD, EA and future DU-series parts - Microchip's latest and greatest AVRs. Library maintainers: Porting help and adviccee is available.
GitMoDu/AVR-ADC-Wrapper
A static, type checked wrapper for AVR devices' ADC.