Oi,
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I've started working on a SAI-Editor for TrinityCore a couple of months ago using C# with the .NET 4.5 framework (which means it's Windows only as I'm not bothering with Mono). The application is, of course, opensource.
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Download & screenshots:Â http://www.trinitycore.org/f/files/file/17-sai-editor/
GitHub: https://github.com/Discover-/SAI-Editor
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Discover-