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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.
Corvo Astral is an open-source Discord Bot that provides information about an MMORPG game called Wakfu, made by Ankama. It's being used in over 230 servers, and it's also featured in top.gg bot listing. It started with a simple command that did some calculation given some character attributes, but as soon as I saw potential for cool stuff to do I went all in.
After implementing the .calc command I got hyped to add the .alma command, which stands for Almanax, the name for the daily bonus that can be obtained in the game. While the current bonus cannot be obtained using an external API, it can be guessed using date manipulation. I was very happy to come up with this solution. And I even used in my guild's website.