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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.
https://github.com/timing1337/Mineplex if anyone wants to attempt getting their own Mineplex running.
A bot which ran across both Minecraft networks (EU and US) and multiple slack workspaces (I believe 8?) to provide staff utilities like punishments, ban history, automatic "VIP" player tracking, network monitoring, and more: https://github.com/ArcticZeroo/spoob
Various websites, including the stats site: https://github.com/ArcticZeroo/webserver-mineplex-projects