NScan.org: the legend is still here ;)

NScan is one of the most fast and flexible portscanners for Windows. It is specially designed for scanning large networks and gathering related network/host information.
It supports remote monitoring, usage of host and port lists, option profiles, speed and accuracy tuning, etc.
It also contains a traceroute, dig and whois, which work together with scanner.

Traceroute is designed for quick network route discovery. Unlike standard traceroute, it traces all the way to host at once, therefore saving tenth to hundreds times. It also measures the time necessary for packet to return and looks up all intermediate routers. Unlike Windows tracert it's based on UDP protocol, so it allows to trace networks, where incoming ICMP messages are filtered.

Whois is a tool for retrieving the information about domains and IP addresses from the whois databases. With it's help you can find an owner of IP address, network or domain. You can also make some advanced queries to find extra information. In automatic search mode it can recognize and search the databases for an IP address or domain in proper databases. You can also select any particular server and ask it whatever you want.

DIG is a TCP-based DNS client that supports most of the available data types. It has two operation modes - traditional and extended. In first mode it asks address or host name by the default means of Windows, just as any application does - you can use it for diagnostics of network setup. In extended mode it uses TCP connection to acquire any info that can be supplied by server, including AXFR (complete transfer of the entire zone). TCP usage ensures reliable data connection and complete data set from server (normal UDP answer data amount is limited to packet size).