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ExtPay
The JavaScript library for ExtensionPay.com — payments for your browser extensions, no server needed.
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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 run https://extensionpay.com which lets devs take payments for their extensions without needing to run their own servers. So I happen to know that my users have made over $11k since I started earlier this year! Not bad.
I also wrote this article showing 7 indie extensions that make quite a bit of money: https://extensionpay.com/articles/browser-extensions-make-mo...