fzf is described as 'general-purpose command-line fuzzy finder' and is an app in the File Management category. There are more than 10 alternatives to fzf for Mac, Linux, Windows, BSD and Vim. The best alternative is Everything, which is free. Other great apps like fzf are DocFetcher (Free, Open Source), fzy (Free, Open Source), Percol (Free, Open Source) and Peco (Free, Open Source).
DocFetcher is a portable German/English open source desktop search application. It allows you search the contents of documents on your computer. - You can think of it as Google for your local document repository.