Decision.io - Decision.io is an interesting platform that provides you the simple features to develop the app or an integrated workflow without using any program language or code.
SQL Police Department - Learn SQL while solving crimes! Climb the ranks of SQL PD.
RapidClipse - RapidClipse is a web-based development platform that allows you to build the app with Java and provides you with a hustle-free configuration.
Slack SQL - Execute SQL queries inside of Slack
Codeless Platforms - Codeless Platforms is a web-based platform that allows you to develop various applications and business processes without any coding and programming.
SQL Play - Run SQL in your phone