AVRA is an assembler for Atmel AVR microcontrollers, and it is almost compatible with Atmel’s own assembler AVRASM32. The programming principles and conceptions are based on the ANSI programming language "C".
The initial version of AVRA was written by John Anders Haugum in 1999. He released all versions until v0.7. All later versions were released by Tobias Weber. And version 1.3.0 is released by Jerry Jacobs.