An audio-stream time-synchronization service that can be used to party

Viewing and listening to media content with dual subtitles, featuring intuitive subtitle navigation, real-time speech synthesis, and adjustable playback speed.

A light weight audio synchronisation platform originating from a shared video source, keeping each audio stream in sync with each other and with the video source.

This script synchronizes video and audio files using ffmpeg and performs automatic synchronization using audio signal analysis. It can delay or advance the audio to match the video based on the specified parameters.

Hue audio sync (open source).