Garage : An open-source distributed storage service you can self-host to fullfill many needs.
CryptPad : CryptPad is the Zero Knowledge realtime collaborative editor.
Encryption carried out in your web browser protects the data from the server, the cloud ...
Kinto : Kinto is a lightweight JSON storage service with synchronisation and sharing abilities.
TellForm : An opensource alternative to TypeForm that can create stunning mobile-ready forms , surveys and questionnaires.
grocy : grocy is a web-based self-hosted groceries & household management solution for your home.
droppy is a self-hosted file storage server with a web interface and capabilites to edit files and view media directly in the browser. It is particularly well-suited to be run on low-end hardware like the Raspberry Pi.