Our great sponsors
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flagsmith
Open Source Feature Flagging and Remote Config Service. Host on-prem or use our hosted version at https://flagsmith.com/
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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 are some spaces where you can find the unique advantages of building OS products. For example https://github.com/Flagsmith/flagsmith. It's a very basic feature flags and a remote config service, but because there are not so many competitors in OS space with the same offering, they can sell on-prem solutions to enterprise customers that care about private data. Their close source competitors have more features, but it does not matter, because some companies just can't store their data outside.