Open Source C++ Speech Software

Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming. It includes game linking, so voice from other players comes from the direction of their characters, and has echo cancellation so the sound from your loudspeakers won't be audible to other players.

Modular Voice Studio is an open-source, ultra-low-latency, node-based digital signal processing (DSP) environment engineered specifically for voiceover artists, streamers, podcasters, broadcast engineers, content creators, and audio purists. Built from the ground up with C++20 and the JUCE 8 framework, Modular Voice Studio combines the visual flexibility of a modular synth rack with studio-grade vocal processing. Build custom audio routing chains in real time with zero phase artifacts, deep-learning noise suppression, surgical spectral correction, and immersive 3D binaural positioning.

AI-Softphone is a free, open-source (GPL) desktop app for Windows, macOS and Linux. It records Zoom, Teams and Meet meetings or calls through its built-in SIP softphone, turns them into searchable transcripts and summaries, and prompts you live with subtitles, translation and suggested replies. Use local or cloud AI.