The official Net::RawIP page from where you can get the lastest RawIP is http://www.ic.al.lg.ua/~ksv/. Net::RawIP written by Sergey Kolychev and he would be the best person to contact if you have any patches, doubts and suggessions.
Most of the excellent source code here is taken from the Authors website and would not be modified. A few other ugly lines code are written by me during my spare time waiting for the end of the world.
Scanning a host using TTL scan can get interesting results by rkt Mar 2003
Perl script which replys to Syn packets by rkt Dec 2002
Another Traceroute tool
Remote DOS by TCP Resource Starvation
RawIP coding in C by Mixter
Arp sniffing tool
Sneeze - Snort False positive generator
TCP hijack/RST script
Implementation of Birthday attack in a DNS Spoofing