Advent of Code is an Advent calendar of small programming puzzles
A small timer based on an ATmega8u2 and PCD8544
A small power-analyzer on an ATmega8u2 and INA219 that allows debugging power consumption of small devices.
OCI Images for Dotnet that are capable of compiling C# NativeAoT
IoT mailbox sensor using an ATtiny85 and ESP-07S
A small handheld snake game based on the ATtiny88-MUR