vnak is an easy to use Python tool to attack multiple VoIP protocols. You can read more about this tool or download it here.

VoIPER is a VoIP security testing toolkit incorporating several VoIP fuzzers and auxilliary tools to assist the auditor. It can currently generate over 200,000 SIP tests and H.323/IAX modules are in development. Read more and download here.

Created by Packetizer, this online bandwidth calculator has attracted users from all over the world, according to its maker. To use it, click here.