MindMeister : MindMeister is an online mind mapping tool that lets you capture, develop and share ideas visually.
Mind42 : Collaborative mind mapping in your browser
SQL Fiddle : A tool for easy online testing and sharing of database problems and their solutions.
SensioLabs Security Advisories Checker : The SensioLabs security advisories checker is a simple tool, available as a web service or as an online application, that uses the information from yo...