The core of this modpack is Angel's, Bob's and Clown's mods with tons of other mods for better experience from the game with lot of fun.
Collections of mods with tweaks to make them work together.
Not supported by some mods.
I've never tested this modpack for multiplayer and was never made with main goal for it. What mods exactly don't work, maybe it is only some small incompatibility.
Sorry for late response.