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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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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.
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ProjectSend
ProjectSend is a free, open source software that lets you share files with your clients, focused on ease of use and privacy. It supports clients groups, system users roles, statistics, multiple languages, detailed logs... and much more!
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Hemmelig.app
Keep your sensitive information out of chat logs, emails, and more with encrypted secrets.
Jirafeau - 252 stars
Pingvin Share allows you to share files with 4 clicks. It has has a few optional options like share password, expiration, visitor limit. The project is in active development
Link
Gokapi works well for me, although it’s admin upload only (which you may want)
Github link
Jirafeau
YouTransfer (unmaintained) - 1.6k stars
psitransfer - 1.1k stars
sharry - 498 stars
I've used https://www.projectsend.org/ on my own server for years. Simple, effective, and free.
I use https://github.com/mtlynch/picoshare