From The RadioReference Wiki
Unitrunker supports control channel monitoring for Motorola Type I and II, Project 25 9600 baud, EDACS, and MPT1327 systems.
A public beta of Unitrunker was just released. It can be downloaded here:
Frequently Asked Questions
Q: Do I need a radio with discriminator tap?
Q: Do I need a slicer?
Q: Do I need a computer that runs DOS?
A: No. This program does not run on DOS.
Q: Will this work on Windows? Is so, what version?
A: Yes - Windows 95, 98, ME, 2K, XP, and 2004.
Q: What types of trunked radio systems can I monitor?
A: Motorola, EDACS, APCO Project 25, and MPT1327.
Q: How can I use this to listen to calls on a trunked radio system?
A: You can't - this isn't supported (yet). You would need a second radio that accepts computer control to tune to voice calls as they occur.
Q: Does the program permit downloading talkgroup information from the RR DB?
A: Yes - but only for Motorola and APCO P25 systems. You must be a paid member with a valid user id for this feature.