Trakstar Performance Management - Trakstar Performance Management is a top-notch solution that makes it easy for companies worldwide to strengthen their people.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
PerformYard - PerformYard is an employee performance management platform.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
StaffCircle - Staffcircle is your Own Branded Employee App for Internal Communications, Engagement, and HR. It is used to support the full employee journey: instruct, inspire, inform, incent, and involve your entire workforce.
mailcow - An open source mailserver suite.