Not sure if it has already been mentioned here before, but I was just introduced to the "EchoStation" software. Let me tell you how it is the best software I have ever come across! I always thought it was really hard and expensive to build my own GMRS repeater. But with this software, you can build your own repeater using a scanner, a computer and a GMRS radio. That is it!
Program has optional ways of connecting equipment together, but I went with the VOX (voice activated) for both the reciever and the transmitter.
Basically, you simply have an audio cable going from the headphone jack of a scanner (or another radio) that is listening on the repeater INPUT frequency (467.xxx) and that plugs into the mic-in or line-input of your computers sound card. Then you have an audio cable going from the speaker or line-out from the computer sound card to the transiever. That's it! Not only does it work just like other high-end expensive repeaters (from a users view), it even can work as a simplex repeater if wanted.
Of course you need to adjust audio settings on your computer and and a few other things too. I also wouldnt rely on this type of repeater setup as much as I would a high-end Motorola, but hey... It's extremely easy and cheap this way.
Check out the link here---> K1RFD EchoStation - Repeater-Control Software for Amateur Radio
You can download and try the software for free for a limited amount of days then you have to register it. Registration is only $19.95.