I am hosting a couple of open source project which you can use for free. Most of these I use myself.
These Services are provided without cost and as is without any warranty. In short: You can use them if you don't abuse them. I might shut down a service or limit the way you can use them but collect as little information as possible.
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Please read the Terms of Service and data protection sections for more information.
Element
Secure communication and collaboration.

Rallly - Schedule group meetings
Create polls and vote to find the best day or time. A free alternative to Doodle.

due.ren url shortener
Free and open source url shortener

Jirafeau
Free & Open Source file sharing website

bin.due.ren
Visit this link to see the note. Giving the URL to anyone allows them to access the note, too.

Stirling PDF
IT Tools - Handy online tools for developers
Collection of handy online tools for developers, with great UX. IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.

Language Tool

LibreTranslate - Free and Open Source Machine Translation API
Free and Open Source Machine Translation API. Self-hosted, offline capable and easy to setup. Run your own API server in just a few minutes.
