Cloudsole Developer is an easy way to develop Salesforce apex classes, triggers, components and visualforce pages. It uses the salesforce API to access your code in a safe and secure way.
Some of the functionality of the IDE:
- Create new Apex Triggers Classes, Visualforce Pages & Components
- Select from a list of predefined templates to create class stubs
- Code debugger
- Run Anonymous Apex Code
- Run SOQL queries
- Run Batch queries
- Metadata viewer and download
- Code Metrics Dashboard
Force.com API Used:
- Force.com OAuth
- Force.com Tooling API
- Force.com REST API
- Force.com Batch API
- Force.com Metadata API
Create new Triggers, Apex Classes, Visualforce Pages and Components:
Code Editor:
Run Anonymous Apex Code:
Code Dashboard:
Run SOQL Queries:
Create Force.com Batch Jobs:
Thys Michels Blog 
Glad to see finally a free and online IDE coming up that too using Tooling API. Thank you and keep the good working going. May be go for http://www.cloudsole.io domain to host the IDE.