For Texas:
TX VHF FM Society Repeater Search
Keep in mind a few factors.
1. There are closed repeaters that have asked to not be listed with the above listed search resource.
2. Repeater trustees that want users to talk generally have other listings in club webpages, local lists, etc.
3. You are unlikely to find any online resource that has complete "up to the minute" data, however where coordination bodies list repeaters they are likely the best source if they provide the data online.
4. For specific DV/DD protocols, there are listings for repeaters within their special interest groups.
If you have bought a digital radio, consider obtaining a low power "hot spot" if you want to carry on conversations. These devices make it possible to find QSO's ongoing for the most part.
The "hot spots' are probably one reason a lot of repeaters don't see as much traffic. Look here:
D-Star REF001 station listing
For many folks it is just easier to link and experiment with their own "hot spot" they control rather then tie up a local repeater for linking.
Craig