The Boarduino is an Arduino clone intended for use on a breadboard (the picture below is from another project):
There’s a DC version with an FTDI connector for programming (shown above), as well as a USB version (which powers and programs the board). Since there is an ICSP header, I decided to leave out the IC socket from this kit.
The Real Bare Bones Board (RBBB) is an even lower-end version. It’s smaller than the Boarduino and omits the ICSP header:
Due to its low cost as a kit, this would be a great option for permanent embedded use.