Motion Capture by EchebKeso
The Mocap mod is a mod aimed at film-makers who wish to record the motion of their character and replay it back via a scripted entity. It allows you to create a whole series of composite characters for use in your own videos without having to splash out on extra accounts or enlist help.
Rubi's Rubies by Ruuubi
Adds uncraftable Gems to the game, which can be used as currency, as well as various blocks to promote trading between players.
Quantum Coins by Mint
Extremely customizable physical currency mod. Aimed more at server economies then SP use.
Memory Bar by Henry Loenwind
Adds the splash screen memory bar to the F3 screen, and with a hotkey to the ingame HUD
BlipBot Points by BlipBot
Let your viewers on Beam gain points by watching and interacting with your stream, which can be used to affect your game.