For email there is Proton Mail or Tutanota
For shared documents and collaboration, I've had good experiences with other people's instances of CryptPad. You can also host your own.
The above platforms have calendars, but I don't have experience there enough to say which ones are practical.
If you need drive space for random sharing, "Mega.nz" is good unless the file is large. In those cases the recipient needs to download their app. 🤦🏻♂️
For video calls there are random Jitsi servers to use; or do this self-hosted too.