Archive notice: This article was originally published on July 15, 2015. Links and embedded videos are preserved as part of the historical record.
Once Bonus Tools 2014–2016 are installed, there is an additional pull-down menu at the end of the main Maya menu. This contains the extra tools.
Autodesk does not offer support for the tool collection, but users can submit problems or suggestions concerning the tool through the Maya Help menu.
Here is an overview from Autodesk of which features the Bonus Tools contain and what has been newly revised.
This video presents the Maya 2016 modelling improvements in general in detail, including those added by the Bonus Tools.
Here you can download the free Maya Bonus Tools. They are available for Windows, Linux and Mac OS X.
All further information about Autodesk Maya here.