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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.
through it you can download simple, but trusted mods from the community. You can also download mods that are not on mod assistant through the modding discord (BSMG). If you want custom songs you can find them on beatsaver or beastsaber, but you will have to put them manually in your customlevels folder or you can download them ingame through mods. Custom sabers and other stuff are on https://modelsaber.com and again you will have to put them ingame manually with a mod called saberfactory. There is also a website called https://scoresaber.com where you can play ranked maps, earn performance points and compare your scores with other people.