The gamemode was originally run exclusively by ShadyLogic's DisclaimerStudios server, but it has since closed down, and EpicRP has become a very fond memory. It began as a simple DarkRP mod, but we slowly added our own features to it, and little by little, it diverged from its base, until eventually (I don't remember which update), we ceased synchronizing it with DarkRP.
It has quite a few nifty features. I had completely redone the HUD (it's even movable via a console command!), added a few weapons of my own (such as a searcher swep for cops), and a few other useful tweaks.
I decided to put it here on garrysmod.org so that maybe someone could get some use out of it. By all means, feel free to use it on your server, just email me if you do at email@example.com
I couldn't get any screenshots of it because it's not being run anywhere any more.
The changelog: http://disclaimerstudios.wikispaces.com/The+Script+Changelog
Note, I forgot to add the 2.7 changes to the log, and I don't remember what they were any more, so consider it a surprise. ;)