Remember the MultiTRX home automation transceiver I made back in 2011? The project is now open source, and I've released a new firmware as well - five years after the previous update! Check out Github: https://github.com/skagmo/multitrx
I just published an update on my little rover project. Mark 3 is WLAN-connected and a Raspberry Pi is now a central part of the design. It was actually finished over a year ago, but I never got around to update the page.