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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 don't know if there is any copyright limitation, but I found an opensource (archived) clone of Agar.io on Github. I read that Agar.io is already a clone from an older game (Osmos) so probably there is no licensing problem at all. Just to be clear: I am just throwing an idea here if there is anybody more skillful than I am who wants to have some fun with the nano protocol. To all the developers we have in our community, thank you for all your amazing projects!