c0nb0x is a control application for the x0xb0x synthesizer.
It's aim is to be an alternative to the original c0ntr0l application, which isn't very stable some times.
Download: c0nb0x_101_win32.zip (2 MB)
Download: c0nb0x_100_macosx.dmg (2 MB) *** v1.01 for OSX is not available yet
Discussion: at the x0x forums
Source Code is available under GPL from the Dev sub-page (see below)
c0nb0x is written in messy C++ but works on windows and osx thanks to the allegro5 cross-platform library.
With c0nb0x you can change the firmware of your x0xb0x via USB (it must have the bootloader).
You can also connect to the x0xb0x (while normally running the firmware) to backup/restore the whole pattern memory.
And you can use the internal pattern editor to edit/import/export individual patterns. The editor uses TB-303 pattern notation.