Anytxt Desktop Search - Anytxt is Desktop Search Tool with A Powerful Full-Text Search Engine.
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Everything by Voidtools - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
Recoll - Recoll is a desktop full-text search tool. Recoll finds keywords inside documents as well as file names.
Agent Ransack - Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently.
FileLocator - FileLocator Lite enables you to locate files on your pc.