Online SQL Editor
Free Online SQL Editor
4 Alternatives To Online SQL Editor
Padlet
Padlet is the simplest web application.
PasteFS
paste tool and a digital assets manager to share text, files, pictures and documents of every kind
SQL Fiddle
A tool for easy online testing and sharing of database problems and their solutions.
If you do not know SQL or basic database concepts, this site is not going to be very useful to you.
db<>fiddle
An online tool for testing, demonstrating and sharing database commands and scripts.