SourceTree is still free. Are you referring to the support expires date under my.atlassian.com? SourceTree changed how it is licensed as of 1.8.x release and you now have to use your Atlassian account to log on when you install it instead of a license file.
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
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