OpenXsensor is the evolution of OpenXvario and extends it to multi-sensing applications.
Discussion about this project: openRC forum thread
Based on an Arduino platform, it connects to different sensors and transmits the measurements via RC industry telemetry protocols.

It is now compatible with :

• Multiplex receivers
• Frsky receivers : D series (HUB protocol) and X series (Smart Port protocol).

• Altimeter / Variometer (like FrSky Variometer low/high precision sensor)
  • Can use a second barometric sensor and switch with TX while flying
• Air Speed
  • Can also be used by oXs to compensate vertical speed measurements (dTE)
• Up to 6 voltages measurements
  • Battery voltage measurements (like FrSky FBVS-01)
  • Lipo battery cell measurements (like FrSky FLVS-01 or FLVSS)
  • ...
• RPM sensor
• Current sensor (like FrSky FAS or FCS)
  • Can calculate the consumed current
• Can use any sensor outputting voltage
  • Temperature sensor
  • ...