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Last tested: May 1, 2020
Here is a list of some online Sandboxes and handy testing tools for SQL databases, HTML, Javascript, CSS, and several other programming languages
| 1 | RexTester | Sandbox online for several programming languages online | https://rextester.com/l/postgresql_online_compiler |
| 2 | CodeSandbox | An Online IDE for Rapid Web Development | https://codesandbox.io/index2 |
| 3 | DB Fiddle UK | Test DB2, MariaDB, Postgresql, SQLServer, SQLite, Oracle, MySQL in browser free | https://dbfiddle.uk/ |
| 4 | SQL Fiddle | A tool for easy online testing and sharing of database problems and their solutions. | http://sqlfiddle.com/ |
| 5 | JS Fiddle | New fiddle or a Boilerplate for HTML/Javascript/CSS test online | https://jsfiddle.net/ |
| 6 | JS Bin | HTML/Javascript/CSS test online | https://jsbin.com/?html,output |
| 7 | W3schools | W3Schools is a web developers site, with tutorials and references on web development languages | https://www.w3schools.com/ |
| 8 | PG Exercises | PostgreSQL Exercises | https://pgexercises.com/ |
| 9 | Jumpseller | Liquid Tests online | https://jumpseller.com/support/liquid-sandbox/ |
RexTester
CodeSandbox
DB Fiddle UK
Jsfiddle
Js Bin
W3schools
PostgreSQL Exercises
Jumpseller
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