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Residing in Austin, TX, Mike is a domain expert on digital authentication and application security. He is the founder of Gluu, an open source software vendor whose platform is used in over 60 countries. He is active in the development of open standards for digital identity, and is the author of “Securing the Perimiter: Deploying Identity and Access Management with Free Open Source Software” published by Apress.
Missing the most obvious: purchase the commercial offering of companies who are developing open source software. Also, prioritize engagement with software vendors who have an open source distribution of their code.
Need SSO or two-factor authentication, in 2017 check out the Gluu Server: http://gluu.org Packages are available for many linux distributions. It's the most comprehensive free open source identity and access management platform available.