dnGREP - dnGrep allows you to search across files with easy-to-read results.
DockbarX - DockbarX is a standalone dock that groups and launches applications.
FileSeek - FileSeek is an easy-to-use file search app that includes advanced functionality for power users!
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.
Ultra File Search - Ultra File Search is a Search Utility which is able to quickly find Files, Folders and Text on your Local, Network, DVD, CD-ROM, USB Hard or Flash Drives.
Gnome Do - Simple, sleek, swift, smart. Do. GNOME Do allows you to quickly search for many items present on your desktop or the web, and perform useful actions on those items. GNOME Do is inspired by Quicksilver & GNOME Launch Box.