SpongyChest is a plugin that utilizes Chests to make in-game item shops for players to sell items to each other!
Special AI by FatherToast
Adds additional AI patterns to mobs to make the game more challenging. 'Passive' mobs will fight back, monsters will break light sources and wooden doors, some mobs gain random extra abilities, and villages are more... village-y.
InGame Info XML by Lunatrius
Display extra information on top of your ingame screen.
opensource clientside HUD
CosmeticArmorReworked by zlainsama
This mod allows you to wear two sets of armor, one for display, one for function. You can also hide armor for your skin. For PVP, you can stop the mod from functioning on your client side.
ColoredLights by Razzokk
This Mod brings colored lamps to Minecraft. It also tries to unify the use of color stuff in general.