PHPRad - PHPRad is an advanced application development environment capable of generating complete applications in PHP using various databases. Great tool for professionals, the best tool for beginners. Little or No Coding Experience Required

QuickBase - Quickbase provides a no-code operational agility platform that enables organizations to improve operations through real time insights and automation across complex processes and disparate systems. ​​

Linx - Integration and automation platform for growing businesses

Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.

Salesforce Platform - Salesforce Platform is a comprehensive PaaS solution that paves the way for the developers to test, build, and mitigate the issues in the cloud application before the final deployment.

Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.