Red-Piranha is an open source search system that can actually 'learn' what you are looking for. It lets you go everywhere , find anything , understand everything.
Because it is open source , it can integrate with any system. Because you can use it as a web page , command line or XML- WebService , it will work with most languages , including Java , Perl , C#/.Net and PHP. As a Java based program , it will run on any platform including Windows , Linux / Unix and Mac.