Miguel Winfield (developer WenFeng Gao) has released a new version of his Maya animation toolset, MGtools.
The plug-in adds or modifies a number of tools within Maya to smooth animation workflow, adding an animation-specific Channel Box and a built-in timer and framerate converter.
New features in MGtools 2.5 include AnimRescue, a real-time automated scene backup system; and a more conventional autosave function.
Beyond that, how useful individual features are comes down largely to personal workflow. You can find a full list via the link below.
MGtools 2.5 is available for Windows only, price $40. It supports recent versions of Maya (broadly speaking, Maya 8.5 onwards, although there is some variation between individual tools).