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chevereto
Self-hosted Image and Video Hosting solution, your own Flickr/imgur media sharing alternative with your rules.
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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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privacytests.org
Source code for privacytests.org. Includes browser testing code and site rendering.
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librephotos
A self-hosted open source photo management service. This is the repository of the backend.
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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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PiGallery 2
A fast directory-first photo gallery website, with rich UI, optimized for running on low resource servers (especially on raspberry pi)
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Piwigo
Manage your photos with Piwigo, a full featured open source photo gallery application for the web. Star us on Github! More than 200 plugins and themes available. Join us and contribute!
Currently using photo stream
Maybe a static site made with Publii CMS may fit your needs.
I don't know why Brave got that hate, for me is very good and for those people who don't like brave.. https://privacytests.org/
Piwigo.org, Lychee was mentioned, https://github.com/photoview/photoview Photoview, PicApport https://picapport.de/en/
There is a mention of it here (search for the term "job" in the page).
Depending what exactly you are trying to achieve https://ghost.org/ might be a tool to achieve this. Beautiful ui and easy to setup.