DBIx::AnyDBD is a Perl module for developers writing cross database applications. It allows you to write "plugins" for different DBD drivers (Oracle, Sybase, etc) so that your application can do different things on different databases. It doesn't provide any compatibility layer - just an intelligent method to switch to the right class to use at runtime.
The NetPacket::* bundle of modules disassemble network packets into a Perl hash for various Internet protocols. There are hooks for assembly of packets, but they have not been implemented in this version. At present, decoding for the following protocols has been implemented: Ethernet, ARP, ICMP, IGMP, IP, UDP, TCP.