Mailman
Description: Mailman is an open source mailing list management system. It helps manage email discussion and announcement lists, allowing users to subscribe and unsubscribe, and helping admins moderate and post to the lists.
Type: software
Pricing: Free
RackMonkey
Description: RackMonkey is an open-source data center infrastructure management software that allows administrators to monitor racks, servers, networks and power in a data center.
Type: software
Pricing: Free