First release of SubSync, a desktop GUI to batch-synchronise .srt subtitles to the audio of their video files (front end for ffsubsync).
Download
Download subsync.pyw below and start it with a double-click.
Requirements: Python 3.10+ with Tkinter, ffmpeg on your PATH, and ffsubsync. See the README for installation steps, including the Python 3.14 note and how to unblock the file on Windows.