This Mod pack uses a variety of mod that mainly entails Vanilla+ mods, with a few bigger mods like The Twilight Forest (which adds a new dimension). I based my modpack off the sdmp server and the mods they used. I am not really a modder and I haven't messed with all of the settings, so do not expect the exact same experience out of the box. (I also don't know what all the settings they play with are)
I also had to at least leave out the canes mod and the mod that lets two players ride the same mount; if memory serves, the mount one crashed, and I couldn't find a compatible canes mod. I think those are the only exclusions, but I'm going off memory, so there could be a few more.
Overall the pack aims to improve some of the default Minecraft systems and adding in new ones to give the player more objectives and playstyles.