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.

Please read the Terms of Service and data protection sections for more information.
Secure communication and collaboration.
A young, modern, encrypted and federated solution for secure instant messaging using the matrix protocol.
Rallly - Schedule group meetings
Create polls and vote to find the best day or time. A free alternative to Doodle.
Rallly is an open-source Doodle alternative. Perfect to find a commong free timeslot for Events. url shortener
Free and open source url shortener
Free & Open Source file sharing website
You can upload files here and Jirafeau will generate a link for you which you then can give to someone else to download.
Visit this link to see the note. Giving the URL to anyone allows them to access the note, too. is a minimalist, open source online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted in the browser using 256 bits AES.
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.