Simple Lossless Ad-hoc Protocol (SLAP) is designed to be used for wireless digital data transfer on embedded systems. The program is built for uClinux, a derivative of Linux designed for embedded microcontrollers, but can be easily ported.
Wep key changer (wepkc) is a client/server application that allows you to protect your ad-hoc (point to point) Wireless network when you are unable to use (due to software or hardware limitations) sophisticated protocols like WPA.