Free CMMS - Free CMMS is a web based Computerized Maintenance Management System. It is free to use.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
BaseEAM - Integrated, open-source Enterprise Asset Management.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
RepZio - Sales Rep Software & eCommerce Platform
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.