This is interesting:
https://console.cloud.google.com/cloudshell
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.
Notes:
Edit bash config:
vi ./.bashrc
Building and testing Docker containers using cloud shell:
Click here