A small collection of mods (that I did not make, nor do I own) that can be used on servers or in single player, but aren't cheating. Of course, you should ask an admin or something if you're not sure, but everything should be allowed (except maybe JourneyMap). If you have any suggestions for mods, put them in the comments. Or don't. You should. But you won't. Why would you? That's what I thought.
Mod List:
The Not Quite Cheating Team
