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DPaint-js
Webbased image editor, modeled after the legendary Deluxe Paint with a focus on retro Amiga file formats: read and write Amiga icon files and IFF ILBM images
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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.
There's a web-based version modeled after the original Deluxe Paint with source code available: https://www.stef.be/dpaint/
https://github.com/bcampbell/evilpixie/releases
[1] Except Deluxe Paint, which it apes shamelessly, down to the keyboard shortcuts. And all the Dpaint clones, of course. And asesprite. And ProMotion. And all the other pixelart apps. But other than that, there's _nothing_ like it out there!