Storing bookmarks of websites.
Doing stuff with containers or their engines.
Display links or widgets on a web UI.
Domain Name Service (DNS).
Manage files/folders remotely.
Help with the management of money or keep track of subscriptions.
Monitor endpoints and possibly provide alerts.
Writing and viewing notes.
Storing password and other secrets.
Web service that allows for sharing mainly text and code.
Managing servers from a UI.
Aiding in development of software.
Manage tasks.
Useful tools.
Store a whole knowledge base.