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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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privacytools.io
Discontinued 🛡🛠 You are being watched. Protect your privacy against global mass surveillance.
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LibreOffice
Read-only LibreOffice core repo - no pull request (use gerrit instead https://gerrit.libreoffice.org/) - don't download zip, use https://dev-www.libreoffice.org/bundles/ instead (by LibreOffice)
I chose to self-host for "free" with NextCloud. Getting it all up and running and accessible requires some involved technical setup, but it is great UX and private and well-documented and supported. It includes a live multi-user editor as part of the Files app, but it is a bare-bones markdown notepad. For heavier multi-user editing, I've had great results after adding Collabora.
Cryptee (https://crypt.ee) all the way
I chose to self-host for "free" with NextCloud. Getting it all up and running and accessible requires some involved technical setup, but it is great UX and private and well-documented and supported. It includes a live multi-user editor as part of the Files app, but it is a bare-bones markdown notepad. For heavier multi-user editing, I've had great results after adding Collabora.
Non-Windows Privacy Tools = https://www.privacytools.io/ ( interesting read )
Libre Office Suite Free = https://www.libreoffice.org/
CryptPad Collaboration Encrypted Suite = https://cryptpad.fr/