You can visit Leo's site for a free download, technical specifications, source code, and to offer help if you would like to get involved in this project.
Technical support is free.
Leo is making the software available free of charge showing that the Unix tradition of free software is extended to other operating systems too. However, its main implementation is as a WWW based search engine. It features a robot and a full suite of cgi programs to enable queries over the Web. The cgi programs can be fully customized as is the case in this site, or they can be used more or less as supplied. Each thread can solve one request.