Mattermost
Description: Mattermost is an open-source, self-hosted online chat service with file sharing, search and integration capabilities. It supports text, images, videos and custom emojis across PCs and phones with instant notifications.
Type: software
Pricing: Freemium
Yate - Yet Another Telephony Engine
Description: Yate is an open-source telephony engine and server for VoIP and legacy telephone infrastructure. It supports multiple protocols and interfaces for building communications solutions.
Type: software
Pricing: Open Source