The Orion Teletrack Az-G is a portable mount for small telescopes. However I believe it is strong and fast enough to be used to track LEO satellites, such as AO-51 and VO-52, using a portable antenna such as a tape measure beam or an Arrow.
There is at least one other open source program that is able to interface with the mount (http://papywizard.org). The Papywizard software directly interfaces with the mount over a serial-Bluetooth adapter, however the Skyscan AZ handheld controller that comes with the unit also includes a serial interface and the last page of the manual includes an instruction set for the serial interface. I would love to take on this project myself, but unfortunately my programming knowledge ended with Atari Basic.
Looking at the example in the manual (using the hand held controller), it may be fairly easy to send commands.
1) calculate the tracking rate desired, multiply by 4
2) convert to 2 bytes (trackrate=TrackRateHighByte*256+TrackRateLowByte)
3) send to mount in following format (all number HEX):
Positive Azm: 80, 3, 16, 6, TrackRateHighByte, TrackRateLowByte, 0, 0
Negative Azm: 80, 3, 16, 7, TrackRateHighByte, TrackRateLowByte, 0,0
Positive Alt: 80, 3, 17, 6, TrackRateHightByte, TrackRateLowByte, 0, 0
Negative Alt: 80, 3,17, 7, TrackRateHighByte, TrackRateLowByte, 0, 0
It is also possible to GET position data. I have tried manually sending commands to the mount via cutecom and it does seem to respond as I expected. Manual can be found at: http://content.telescope.com/rsc/img/catalog/product/instructions/29295.pdf