Docco is a personal document retrieval tool based on Apache's Lucene indexing engine. It allows you to create an index for files on your file system which you can then search for keywords. It is not only a lot faster than searching by recursing through your file system every time, it also offers you extended query options like wildcards and fuzzy search as well as a visualization of result set intersections.
QuickFind is a cross-platform Java application for searching files in your computer. Its sole purpose is to save user time by searching the desired file almost instantly. It is designed to support all of the major computer platforms. The user can schedule caching or manually cache at any time on selected directories. Once the caching is done, all you have to do is input the name of the file you want to find.