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.
SutiHR - HR Software Solution for SMBs
Kolab Community - Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
Oorwin - AI Powered Integrated CRM, ATS and HR Platform
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Greenhouse - Greenhouse Software makes companies great at hiring.