Synapse Indicator: New Search AppIndicator Based On Synapse Launcher

Synapse Indicator is a new, unofficial search indicator created for elementary OS. The application should also work under Unity, the Ubuntu GNOME fallback session or in Cairo Dock.
Like the name suggests, this is a front-end for Synapse, a semantic launcher used to start applications and find relevant files using Zeitgeist, extensible through plugins. It's a great, lightweight alternative to the once very popular GNOME Do or, more or less, to Unity's Dash.