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.
Legal Suite - Legal Suite is a leading international provider of Enterprise Legal Management (ELM) solutions.
Kolab Community - Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
Legal Files - Legal Files is a legal case and matter management system that can deliver an optimal solution for all legal case management needs.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
The Attorney Case File - The Attorney Case File offers full flexibility and incredible detail for handling case your office handles.