The application Bulk Crap Uninstaller, or BCU for short, is designed for automating the removal of large amounts of unwanted applications quickly with minimal to no user input.
Some of the key features are the automated deep scan capabilities, that can detect most applications and games even portable or unregistered, clean up leftover files and registry entries, force uninstall by closing and stopping running processes and services, automatically uninstall according to premade lists, and much more.
It can be downloaded here, for installation or portable use, under an Apache 2.0 open source license, meaning that it has a free license for both private and commercial usage.