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oniontip
OnionTip is a web app which parses Tor relay data to allow users to tip volunteers for running relay in a fair and open way.
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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.
> People can do things altruistically - there doesn't always need to be a bitcoin-style monetary incentive.
For a few years Oniontip [1] allowed tipping Tor relay operators with Bitcoin. In my opinion that was a quite nice combination of technologies, as it allowed to anonymously tip operators of a service providing anonymity on the internet.
[1]: https://github.com/DonnchaC/oniontip