Pinned plugins
Craft bottles of enchanting by using an empty bottle on an enchanting table.
Allow player to /vote on important actions: Server restarts, render distance, game diff, player timeouts, etc...
Charge soul gems with XP and use them in the vanilla enchanting table instead of lapis. Echo gems add +1 level.
Skip the night when a percentage or a minimum number of players are sleeping - admins set both in game.
Endermen return stolen blocks to their original spot, with safe nearby placement after 10 seconds of failed attempts.
Brew phantom membranes into repellant and enchant your helmet to ward off phantom attacks.
Get banners for killing mobs which will prevent them from spawning.
Minecart speed boosts and fast travel along ride-registered lodestone rail lines; each player can opt out of either.