Unity's new Mechanim system is really useful and powerful, but sucks when trying to use Mechanim based code. AnimEdit is simply a program that empowers the old Animation system, allowing you to apply "Edits" to your animations during run-time. This will allow you to Rotate joints, move joints, and make joints look at points in 3D space. This will allow the old unity animation system to compete with Mechanim on a functional level, while still maintaining it's simple and robust coding tools.
Unity's audio controls can be a little convoluted at times. Simply playing a sound can include 5+ steps of setup before you get the required result. Dynamic Audio is a script that acts like a pooling function for audio sources, allowing you to simply run all audio calls through script, allowing Dynamic Audio to do all the setup for you. This will also include On-call functions that will allow you to seamlessly edit the volume, pitch, speed, and frequency of sounds you play, allowing you to create some pretty impressive audio systems with little to no effort.