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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.
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uploadserver
Simple Rust file server which lets you upload, share, and download files from a web browser. Ready-to-run binaries for Windows, Mac, and Linux. Free/Open-Source alternative to AirDrop/Dropbox for transferring files on your local network without having to install anything. A more sophisticated version of `python3 -m http.server 8000`.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I tend to use snapdrop.net when everyone is on the same network otherwise https://www.sharedrop.io/ works well too
Another option (also not Airdrop compatible) is https://github.com/akovacs/uploadserver which is a Rust (Rocket) web server that you can run on a local machine. Open a browser and navigate to the machine's IP address at port 8000 to upload/download files from the web form.