CivicRec - Parks and Recreation
Asterisk - An open source telephony switching and private branch exchange service for Linux.
InnoSoft Fusion - Fusion makes it easier than ever to manage organization's recreational facilities and members.
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.
ActiveNet - ActiveNet is a SaaS-based recreation and event management solution built for local communities, companies, non-profit organizations, and entertainment managers.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.