Tools and platforms I like
Oracle Apex (Now Oracle Cloud) for developing web applications on the browser including mobile apps! All you need to know is SQL and PL/SQL.
Force.com from Salesforce for developing apps on Salesforce's platform including mobile apps!
Informatica Cloud from Informatica for integrating data between apps on Informatica's cloud based platform!
Data Direct (Cloud)
Datadirect for reading and writing data to SaaS apps and other applications with SQL