This is interesting:
A free shell for any google account holder, and 5Gb persistent home directory.
Intended as a control point for your google cloud services, it's useful even if you don't use google cloud. Useful for troubleshooting network stuff.
Seems to have a good selection of normal tools such as nano editor, SSH etc.
Will add more here if I find interesting uses.
Edit bash config:
Building and testing Docker containers using cloud shell: