dnswalk
dnswalk is a DNS debugger. It performs zone transfers of specifieddomains, and checks the database in numerous ways for internalconsistency, as well as accuracy.
DMitry
DMitry (Deepmagic Information Gathering Tool) is a UNIX/(GNU)Linux Command Line Application coded in C. DMitry has the ability to gather as much information as possible about a host. Base functionality is able to gather possible subdomains, email addresses, uptime information, tcp port scan, whois lookups, and more.
0trace
0trace is a hackish utility to run traceroute within an established TCP connection, thereby bypassing some stateful packet filters.