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WoWAnalyzer
WoWAnalyzer is a tool to help you analyze and improve your World of Warcraft raiding performance through various relevant metrics and gameplay suggestions.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I tried hekili once on fire mage. It didn't go well. Literally couldn't keep up with combustion. I'm not really sure if its better on other specs, but it's certainly a bit slow and I'm not really sure it helps you learn. You can maybe use it to diagnose issues or try to look for an "ideal" rotation to compare yourself. But you can also use logs and wowanalyzer.