Tiny AVR Programmer - Two ISP headers to use with other AVR microcontrollers - Plugs directly into USB port: Attiny: Amazon.com: Industrial & Scientific
flashing ATtiny85 with Tiny AVR Programmer (2) - YouTube
Tiny USB programmer AVR microcontrollers AVRDUDE – Electronics Projects Circuits
Robustness on tinyAVR® 0- and 1-series and megaAVR® 0-series