EasyFind is a useful freeware search tool that can be a substitute for--or, more likely, supplement to--Spotlight in the Mac OS.
Spotlight has made great strides in recent years, but its lack of speed and specificity can still leave some users frustrated--especially older Mac users who miss pre-Spotlight standalone search apps like Sherlock. EasyFind is a more blunt search tool, and unlike Spotlight, it doesn't index your hard drive. That means it searches your entire hard drive (or whatever location you specify) from scratch every time you enter a query, and it lets you set quite a few parameters around your search: you can search files, folders, or both, as well as file contents, and EasyFind lets you search for any word, all words, or a phrase. You can also use boolean operators and wildcard searches (with options for ignoring case and umlauts, and performing fuzzy searches), and you can search within package contents and invisible files and folders. A dropdown lets you quickly switch between search locations.
EasyFind supports drag-and-drop and uses very few resources--so even without indexing, it can still perform relatively quick searches, especially of smaller, specific folders. Many users won't have any need for EasyFind, but if you ever find yourself frustrated with Spotlight, this free little app can be a handy addition to your arsenal.