Am I able to use any other software to communicate with my Vortex-i or xt stand?

Answer: 

The control, data acquisition and safety features of the Mecmesin Vortex-i & xt systems have been designed and developed to be used as a complete system along with Mecmesin's ITC torque cells and Emperor™ Torque software.

Therefore the proprietary communication protocol used between the Vortex-i or xt system and Emperor™ is not available for release to interface with other software / equipment.