At a minimum avrdude to upload pre-compiled code to AVR/Arduino stuff via USB/serial/bluetooth.
the Arduino IDE would be nice to edit in the field, but I think that might require chroot debian with all of the java, my debian install works but updating is tricky with the old kernel and debian repos.
I tried ArduinoDroid on my Cyanogen Nexus7 but it crashes on load and is so damn fragile.