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The latest MonoDevelop release is: 7.6 (7.6.9.22)
Source code is available on GitHub (viewing only) or as a Tarball.
Alternatives to MonoDevelop
MonoDevelop is no longer under active development, we recommend using Visual Studio Code with the C# DevKit extension as an alternative: Getting Started with C# in VS Code
Release Notes
Check out the release notes of all MonoDevelop versions on the releases page.