I see most of us in the developer community wanting to develop Sage CRM Client Side customizations via Javascript, but we when we use Visual Studio may not have great flexibility in writing client side code, This studio i.e. Web Storm helps you write Javascript based code for both HTML & HTML 5 with great ease and I see this as a must tool for every one in the community.

http://www.jetbrains.com/webstorm/features/index.html

Happy coding

Kannan