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public-apis
Discontinued A collective list of free APIs such as http://ipstack.com, http://fixer.io/, https://numverify.com/, etc. for use in software and web development. [Moved to: https://github.com/public-apis/public-apis] (by toddmotto)
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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.
Can you come up with a voice command under the browser that could be useful the user while browsing the web. Like something new Alexa skills but for browser. Example: Here are couple of commands to look at.
This and this are both examples of collections of apis you can use.