An open source video trimmer is a program that cuts a video file without re-encoding the rest of the clip. Get the current build from the official GitHub releases. Open the latest release. Pick the file for your machine. Windows, macOS, and Linux are on that page.
Releases on this pageThey publish the current builds on GitHub Releases.
Mikael Finstad publishes LosslessCut under GPL-2.0. Official files live on GitHub Releases.