Recoll is a free, open source, desktop search tool that can find nearly any type of text on your system and incorporates boolean searches (including wildcards) file stemming, and file type filters. It also includes auto-completion of search topics, so if you search for "lifeh" you'd get Lifehacker, Lifehouse, etc.
Based on the Xapian search engine, Recoll can search any file name along with the content of text, HTML and mail files upon installation; with the proper plugins you can search inside PDFs, MS Office files, OpenOffice files, audio file tags and compressed archives along with many other document types.
As the developer says:
Recoll can index an MS-Word document stored as an attachment to an e-mail message inside a Thunderbird folder archived in a Zip file (and more...). It will also let you open a copy of the file without any fuss. There is little that will remain hidden on your disk.
If you need a little more search power for your Unix/Linux system, consider giving Recoll a try. Compared to Google Desktop and Beagle Recoll has additional features such as auto-completion and since it indexes manually you won't have to worry about losing system performance while you're working or gaming.
Recoll is a free download from the developer at the link below and can also be found in Ubuntu and Fedora packaged binaries.
[Les bons comptes via One Thing Well]