Dialfire - Cloud Calling at Jet Speed
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
LeadDesk - LeadDesk is a powerful tool for lead generation, predictive dialing, contact center management, and information delivery.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
contactSPACE - contactSPACE is a cloud contact centre software for the SME.
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.