Hashcat calls itself world’s fastest password cracking tool with world’s first and only GPGPU based engine. For using the tool, NVIDIA users require ForceWare 346.59 or later and AMD users require Catalyst 15.7 or later.
This tool employs following attack modes for cracking:
Hybrid dictionary + mask
Hybrid mask + dictionary
Mentioning another major feature, Hashcat is an open source tool under MIT license that allows an easy integration or packaging of the common Linux distros.
Available Linux ~ OSX ~ Windows Platforms.Download Tutorial