Nmap
Open Source
Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool.
mtr
Open Source
mtr combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.
Zenmap
Open Source
Zenmap is the official cross-platform GUI for the Nmap Security Scanner. It is free and runs on Linux, Windows, Mac OS X, etc.
Compare Angry IP Scanner with alternatives
Compare Nmap and Angry IP Scanner and decide which is most suitable for you.
Compare Zenmap and Angry IP Scanner and decide which is most suitable for you.
Compare mtr and Angry IP Scanner and decide which is most suitable for you.