mist told me to make a list of plugins to add to the server, here are some I've found.

https://github.com/Mooy1/InfinityExpansion - Infinity Expansion adds a bunch of cool raisin. Standard kitchen sink type of plugin.
https://github.com/Slimefun-Addon-Community/ExoticGarden - Adds a bunch of food. Also adds actual bacon.
https://github.com/TheBusyBiscuit/luckyblocks-sf - Lucky Blocks which can also generate in unloaded chunks. Loved these when I was a little kid.
https://github.com/TheBusyBiscuit/ExtraGear - Adds more gear with extra enchantments.
https://github.com/Slimefun-Addon-Community/ExtraHeads - Adds heads for more mobs. Nice decorations and now you can do blackface with witch heads.
https://github.com/Slimefun-Addon-Community/MobCapturer - Capture mobs to put in a j- I mean to craft spawners.
https://github.com/Sefiraat/slimeTinker - Tinkers Construct with slimefun. Fuck yeah this ones great.
https://github.com/FN-FAL113/RelicsOfCthonia - Kill or mine raisin in the nether to get relics to trade for sf stuff. I've seen this one on servers and it makes life way simpler.
https://github.com/GuizhanCraft/GeneticChickengineering-Reborn- super chicken eugenics
https://github.com/GallowsDove/FoxyMachines - more machines and bosses
https://github.com/Seggan/SlimefunWarfare - make chlorine gas and other war supplies

Ill probably find more soon, but these are the ones Ive seen and liked.