The best open source alternative to SmartGit is GitAhead, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to SmartGit and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SmartGit are GitHub Desktop (Free, Open Source), TortoiseGit (Free, Open Source), Git Extensions (Free, Open Source) and gitg (Free, Open Source).
TortoiseGit is a Windows Shell Interface to Git and based on TortoiseSVN. It's open source and can fully be build with freely available software. Since it's not an integration for a specific IDE like...
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Almost everyone thinks TortoiseGit is a great alternative to SmartGit.
Git Extensions is a standalone UI tool for managing git repositories. It also integrates with Windows Explorer and Microsoft Visual Studio (2010/2012/2013/2015/2017). Linux is supported by 2.51 version with some issues.