FoxTrot Professional Search!

Meet DEVONthink — designed to manage and keep in order all those disparate pieces of information so important to your work or studies. As you become more experienced with DEVONthink and its easy, intuitive interface you will quickly find more exciting ways of using your data.

Yojimbo makes keeping all the small (or even large) bits of information that pour in every day organized and accessible.

With Yep 2, you can easily track over 100,000 documents like PDFs, iWork and Office documents, use Quick Look or Yeps built-in magnifier to view documents, file documents automatically into a date-based folder system within your Documents folder, create text files from dragged-in text without any naming or filing on your part, create PDFs by simply scanning documents. Add tags to classify and manage documents (Yep uses the OpenMeta tagging standard). Unlike some other applications, Yep does not store any data in a database, or move your files into any special folder or package. Edit, save and manage documents anywhere on your system. »

HoudahSpot is an advanced file search tool for Mac.