= Recoll = 
 is a personal full text search tool for Unix/Linux.
[http://www.lesbonscomptes.com/recoll/]



 = Xapian = is an Open Source Search Engine Library, released under the GPL. It's written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C#, Ruby and Lua (so far!)
[http://xapian.org/]