ChatFuel by abecderic
Generates energy (RF and EU) from things said in chat (ingame and IRC). Fully configurable.
GuiAPI by ShaRose, lahwran
API designed to make it easy to generate GUIs, aimed particularly at settings menus.
Infinitely Spreading Water by Techern_Cruz, HoldYourWaffle
Fill up your pools and dams with these creative items
Functional Aesthetics by uberifix
A mod that adds cosmetic blocks that are resource pack dependent. This allows the mod to fit in well with nearly any resource pack.
RiteClicker Mod by OCDiary
This mod add the functionality originally introduced by Vazkii in Garden Of Glass, where right clicking dirt or grass will drop stones.
Slime Mod by taurose
This mod expands your F3 screen to indicate whether you're in a slime-spawning area. It takes both slime chunks and swamps into account, and also checks the height. Also works in SMP.
Cascading Meme Lag by Androsa
Using super-extensive, highly detailed algorithms and equations, this mod picks out memes loaded into the world in excess, just like cascading worldgen lag. These days people load so many mods, even ones with high meme density, that the memes collate until it starts to overload the world. This mod won't fix it, there's no way to fix it, but it will pick out the memes loading in excess.