Gnuella P2P in PHP Based off of open source PHP capnbry with small mods
- Good code to learn the concepts of programing PHP. Not really useful for scrapping or http access to Gnutella networks (e.g. Limewire) as those clients tend to block out such HTML based download programs. The live example never works anymore but the script is educational.
Example: Surfy Gnutella    Free Download: Surfy Gnutella Source [zip]

Multi-search Multi-threaded Perl program for grabbing content from search engines
- Current supports Google, Dmoz and Yahoo News.
Example: Surfy! Web Search    Price: USD$200. Email for more info.