open-source telephony API platform / CPaaS

FreeSWITCH is an open-source software telephony switch that routes and processes voice, video, and messaging calls over IP networks using standard protocols such as SIP and RTP. It serves as both a call routing and switching engine and a programmable telephony API, enabling developers to build custom telephony applications with event-driven call control and media manipulation. As a SIP media server, it handles media streaming, transcoding, and conferencing, and functions as a unified communications platform integrating voice, video, messaging, and conferencing into a single switchable infrastr

Fonoster is a conversational AI framework and multi-tenant communications platform as a service. It serves as a programmable voice gateway and SIP telephony platform, enabling the creation of voice-based assistants and automated communication workflows using large language models. The project distinguishes itself through a vendor-agnostic speech integration engine that abstracts speech-to-text and text-to-speech providers. It features a multi-tenant architecture that isolates telephony resources and user identities into distinct organizational workspaces. The system covers a broad range of t

This is a Rust library and peer-to-peer toolkit that implements the WebRTC protocol. It provides a network stack for establishing direct audio, video, and data streaming between peers to achieve low-latency real-time communication. The project is designed as an async-compatible network stack that maintains compatibility across different asynchronous runtimes and executors. It further functions as a deterministic protocol testing tool by separating communication logic from network I/O, allowing protocol behavior to be verified without using live network traffic.

aiortc is a Python implementation of the WebRTC protocol, providing an asynchronous stack for real-time audio, video, and data streaming between peers. It functions as a media engine and data channel implementation that manages peer connections through a non-blocking framework. The library enables the establishment of direct peer-to-peer networking by negotiating session descriptions and connectivity paths. It facilitates secure, bidirectional data transmission via data channels and supports low-latency media streaming using standard codecs. The system includes capabilities for network NAT t

PeerJS is a real-time communication library and framework designed to establish direct peer-to-peer data and media connections between browsers. It provides a simplified wrapper for managing the lifecycles of WebRTC connectivity, enabling the exchange of audio, video, and data without a central relay. The project includes a coordination server that handles signaling management by mapping unique user identities to network connection details. This server facilitates the discovery of remote peers and the exchange of metadata required to perform the initial connection handshake. The framework su

react-native-webrtc is a mobile framework wrapper and peer-to-peer communication library used to integrate real-time audio, video, and data communication into cross-platform mobile applications. It functions as a tool for capturing device screens and streaming live media content via the WebRTC protocol. The project provides an interface for bidirectional data channels, enabling the exchange of arbitrary data packets between peers without a central relay server. It supports real-time media streaming, including peer-to-peer audio and video transmission and screen capture capabilities. The libr

ejabberd is a multi-protocol communication gateway and scalable server that implements XMPP for instant messaging and presence. It serves as a federated messaging platform, enabling interoperable communication and user discovery between different remote servers. The project functions as an MQTT message broker for lightweight IoT device communication and a SIP signaling server for managing voice and multimedia signaling traffic. It allows for the hosting of multiple domains on a single instance using virtual hosting to isolate configurations and prevent username conflicts. The system provides

Venom is a TypeScript library for building automated bots that interact with WhatsApp. It provides a complete toolkit for programmatically managing chats, groups, and messages by bridging into the WhatsApp Web protocol through WebSocket communication. The library handles authentication via QR code scanning, session persistence to avoid repeated logins, and real-time event listening for message delivery, edits, deletions, and connection state changes. The library offers a command-based routing system that directs incoming messages to handler functions based on pattern matching, alongside an ev

Botkit is a multi-platform chatbot framework designed to build conversational bots that operate across different messaging services using a unified interface. It provides a core system for multi-platform development, utilizing a platform adaptation layer to translate service-specific API payloads into a standardized internal format. The framework features a conversational dialog manager that coordinates multi-turn interactions through state-tracking, branching logic, and scripted flows. It employs a message processing middleware pipeline to intercept, normalize, and enrich incoming and outgoi

Plain-app is a multi-purpose toolset for self-hosted device management, providing a web-based dashboard to remotely access files, system settings, and notifications on a mobile device over a local network. It functions as a remote gateway for SMS and notifications, a peer-to-peer file transfer system, and a media server for streaming content to browsers or casting to televisions via DLNA and Chromecast. The project emphasizes secure local connectivity, utilizing TLS and XChaCha20-Poly1305 encryption to protect traffic between the mobile device and the browser. It also includes a distraction-f