History
The radare project [http://radare.org/] started in February of 2006 aiming to provide a free and simple command line interface for a hexadecimal editor supporting 64 bit offsets to make searches and recovering data from hard-disks.
$ rasm2 -a x86 -b 32 'mov eax, 33'
$ echo 'push eax;nop;nop' | rasm2 -f -
It can be used to check the integrity of or track changes between big files, memory dumps or disks.