Recoll is a personal full text search tool for Unix/Linux.

It is based on the very strong Xapian search engine library, for which it provides a powerful text extraction layer and a complete, yet easy to use, Qt graphical interface.

Recoll is free, open source, and licensed under the GPL. The current version is 1.17.1 (Release notes).

Recoll will 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 help you search for it with a friendly and powerful interface, and let you open a copy of the file without much fuss. There is little that will remain hidden on your disk. More details …

If you have problems with Recoll, documentation and support are available.

Recoll user ? Maybe there are still a few useful search tricks that you don't know about. A quick look at the search tips might prove useful ! Also the Faqs and Howtos on bitbucket.org, and some contributed result list formats.

News:

2012-03-27: The Unity Lens can now handle results for embedded documents, using the Recoll GUI as a proxy to extract and display them.
2012-03-26: Recoll gets a Ubuntu Unity Lens. If you are running an Ubuntu release where this makes sense, you can install the recoll-lens package from the Recoll PPA.
Please note: for now, the Lens will only return results which are normal files, not embedded documents. Ie: no mbox messages, no attachments, no archive members, etc. For now, you'll have to use the full Recoll GUI to find these.
2012-03-24: Release 1.17 is out, see the Release notes.
2011-11-26: the result list glitch: ennoying and easily worked-around: it will sometimes happen (for a yet undetermined reason) that the result list paragraph format stored in the Qt preferences file will get garbled, causing result lists with no displayed paragraphs (the counts and pages are ok, the results can be seen in table mode, but not in list mode). The workaround is to go to
Preferences->Query configuration->User interface
and erase the result paragraph format string (^A DEL in the text area), this will reset the string to the default value.

Thanks

Recoll borrows a lot of code from other packages, and welcomes code and ideas from contributors, see some of the Credits.