Maybe you know, we are manufacturing SimpleOSD since tree years and i'm planning to converting it to opensource since one years.
2 month before Dennis Frie contact with me for an opensource OSD hardware, because he was developing an opensource firmware over Arduino base. I replaced a SimpleOSD board with arduino boot and 16Mhz crystal and sent to test. Results was very impressive and Dennis shared the code with SimpleOSD board support. Now We calling this boards as SimpeOSD OPEN
Today we finished the production of first 20 units of SimpleOSD OPEN boards and they are in stocks now.
Dennis developing MultiCopter and FPV type OSD screens on the firmware and maybe you can help him about APM or other autopilot compatible firmwares?
Here is the DIY OSD topic on RCG