dnSpy is a debugger and .NET assembly editor. You can use it to edit and debug assemblies even if you don't have any source code available.
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dotPeek AlternativesOnly apps categorised as Game Development Tools
The best Game Development alternative to dotPeek is dnSpy, which is both free and Open Source. If that doesn't work for you, our users have ranked nine alternatives to dotPeek, but unfortunately only two of them are Game Development Tools.
Alternatives list
11 dnSpy alternatives
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