The password cracking tool Hashcat has been released as open source under the MIT license. The source code for both utilities Hashcat and oclHashcat is now available on the GitHub repository. The developer, Jens atom Steube, decided to release the software to allow software and security experts to review the code and improve it, for example integrating external libraries. Steube in the past worked with experts at Kaspersky Lab, assisting them in cracking hashes related to the Gauss malware and the Equation group.”]
Source: http://securityaffairs.co/wordpress/42633/hacking/hashcat-open-source.html