An open source video trimmer on GitHub means the official repo and the releases page. The repo is mifi/lossless-cut. Releases are the page you want for the current build. Repo and Releases both open in a new tab. Files stay on GitHub.
Repo and Releases both open in a new tab. Files stay on GitHub. This site does not host them.
Back home, or Open Source Video Trimmer Releases for the steps.