Mikee
NotEnoughCodecs
Mod that adds extra stream codecs (MP3 and AAC) to Minecraft. Note: this will not reneable OpenBlocks radio. Sorry.
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ClicketyClack
Small client-side mod made for recording tutorials. Displays mouse and keyboard indications in screen corner. Like this.
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Whodunit
Debug tool for tracking calls to selected method. May be used for tracking lag sources (like orphaned chunks). Can output data in GraphViz format.