The Welkin Suite 

The Welkin Suite is a new generation Force.com platform IDE that allows you to work with Apex, Visualforce, HTML, CSS, JavaScript. It also allows you to execute unit tests, SOQL queries, and anonymous apex. In The Welkin Suite, the functionality is built around the axis of the ultimate comfort for the developer. The IDE provides a range of features to accelerate the development process and automate as many tasks as possible - namely, Code Assistance options (Intelligent Code Completion, Code Highlighting, Code Snippets, Syntax Highlighting, etc.), Multifunctional Scrollbar, separate editors for various languages (Apex, HTML, CSS, Javascript, Visualforce), and more.