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chatgpt-clone
Discontinued Enhanced ChatGPT Clone: Features OpenAI, Bing, PaLM 2, AI model switching, message search, langchain, Plugins, Multi-User System, Presets, completely open-source for self-hosting. More features in development [Moved to: https://github.com/danny-avila/LibreChat]
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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.
The Plugins model used to use GPT-3.5, but not anymore. I would prefer if you had a choice whether to use them on GPT-3.5 or GPT-4. Although there is a ChatGPT clone made in GitHub that will be integrating plugins soon with the option to use it in GPT-3.5: https://github.com/danny-avila/chatgpt-clone.