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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 want to share https://www.pychess.org/ as well - while it doesn't have hexagonal chess, it has tons of variants and you can play both against the computer (that runs fairy stockfish - an engine that works with many chess variants) and against human players
My current favorite is https://www.pychess.org/variants/empire - it's been designed to be wildly asymmetric but actually the balance between the two armies are more even than regular chess' white vs black pieces.
My problem is that there is no literature, no published theory on most chess variants. At least I can't find any theory on empire ehess, and thus I have to develop strategies on my own - but that's how I played chess 20 years ago and it was awful.
The best part of chess IMO is the social aspect of having an evolving theory (or as other games call it, an evolving metagame), and the way we can learn theory to be able to quickly assess who is winning at a given position (a highly nontrivial task), or assess whether a move is "natural" or not.
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PyChess: Play traditional and modern Chess variants
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New responsibility just dropped 👶
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Chess but each player can set up the pieces without the other player seeing
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Does anybody know a website to play faerie chess? (no, i did not misspell fairy, faerie chess is actually a thing, search it up on youtube if you want)