disroot.org is a worthy mention. From their faq: What services can I use with my Disroot account? Your account allows you to use the following services with the same username and password:

Email Cloud Akkoma Chat The rest of the services (Pads, PasteBin, Upload, Search, Audio, Calls, Translate) don’t require any registration. Some need the creation of a specific account (Forgejo, Cryptpad, Scribe).