ExpressVPN on Tuesday launched a suite of open source tools that let users test for vulnerabilities that can compromise privacy and security in virtual private networks. Released under an open source MIT License, they are the first-ever public tools to allow automated testing for leaks on VPNs, the company said. The tools are written primarily in Python, and available for download on Github. Originally used to conduct automated regression testing on ExpressVPN's own software, the tools allow users to check VPNs that might not be providing complete protection to users, said Harold Li, vice president at ExpressVPN.