Of course, the two RAD tools of greatest interest to DevRoadmaps users are Clarion and WinDev. But there are many other RAD tools out there. 

Feel free to add to this list! 

• Ironspeed - database-driven web development using ASPX in an MVC architecture. 
• CodeCharge - web development in ASP.NET (C#), ASP, PHP, Java Servlets, JSP, ColdFusion and Perl.
• Ruby on Rails - "... an open-source web framework that's optimized for programmer happiness and sustainable productivity." Emphasis on convention over configuration. 
• uniPaaS - RAD environment to produce Rich Internet Applications. "Do it Once. Do it Right. Total Mobility Experience."
• EBase Xi - "Ebase Xi combines browser and mobile app development, data integration and enterprise workflow to deliver the world's best rapid application development platform"