Cymbal - Music discovery powered by friends
Everything by Voidtools - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
Noted - Social music discovery
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
humit - A social networking app for music sharing and discovery.
X1 Search - X1's Lightning-Fast Search Software. Premium Alternative to Windows Desktop and Outlook Search.