A complete, cross-platform solution to record, convert and stream audio and video.
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
canonical libwebsockets.org networking library https://github.com/warmcat/libwebsockets
sox_ng is another Swiss Army Knife of sound processing utilities. It can convert audio files to other popular audio file types and also apply sound effects and filters during the conversion
OpenSIPS is a GPL implementation of a multi-functionality SIP Server that targets to deliver a high-level technical solution to be used in professional SIP server platforms.
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms