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freeciv
Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization. Upstream repository for the standalone Freeciv client and server. Report bugs and submit patches at https://osdn.net/projects/freeciv/ticket/
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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.
Don't forget the freeciv project. http://www.freeciv.org/
Between that and https://github.com/jef/streetmerchant I have been able to get the cards I want for decent prices over the last few months.