The three chips tend to program most are the ATMega328, the ATTiny2313 and ATTiny85. I had shields for all three and decided to put them together into a single shield, and also sell that shield in my store. This is the result.
Simple open source Arduino shield for programming ATmega328s, ATTiny2313 and ATtiny85 (and those ICs with similar footprints).
So, a store link or something?