freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Dimelo By RingCentral - Dimelo, Unified management platform for your digital conversations
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
Callback Widget by PHPJabbers - Add our Callback Widget on your website and allow your visitors to request immediate and easy contact with your sales or customer support team.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Gainsight - Customer Success for the New Enterprise