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1. TinyCore TinyCore Public

   A light-weight Arduino hardware package for ATtiny25/45/85, ATtiny24/44/84, ATtiny441/841, ATtiny261/461/861, ATtiny87/167, ATtiny48/88, ATtiny2313/4313, ATtiny1634, ATtiny828, ATtiny43 and ATtiny26

   C++ 16 2

2. MightyCore MightyCore Public

   Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535

   C++ 710 193

3. MegaCore MegaCore Public

   Arduino hardware package for ATmega64, ATmega128, ATmega165, ATmega169, ATmega325, ATmega329, ATmega640, ATmega645, ATmega649, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega3250, ATmega3290…

   C 415 129

4. MiniCore MiniCore Public

   Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB

   C++ 1.1k 274

5. MicroCore MicroCore Public

   A light-weight Arduino hardware package for ATtiny13

   C++ 609 92

6. MegaCoreX MegaCoreX Public

   An Arduino hardware package for ATmega4809, ATmega4808, ATmega3209, ATmega3208, ATmega1609, ATmega1608, ATmega809 and ATmega808

   C++ 274 59