Here's a completely rewritten "Arduino as ISP" sketch that can program the ATtiny85, in situ, on the Digispark board via its 6- and 3- pin connectors. It uses an Arduino Uno R3 as the programmer, and ...
A high-speed, native USB ISP programmer implementation for the Arduino Due (SAM3X8E), emulating the popular USBasp protocol. This project turns an Arduino Due into a robust AVR In-System Programmer ...