Dsniff
Old: 2000~ish
Excerpt from the web page:
dsniff is a collection of tools for network auditing and penetration testing. dsniff, filesnarf, mailsnarf, msgsnarf, urlsnarf, and webspy passively monitor a network for interesting data (passwords, e-mail, files, etc.). arpspoof, dnsspoof, and macof facilitate the interception of network traffic normally unavailable to an attacker (e.g, due to layer-2 switching). sshmitm and webmitm implement active monkey-in-the-middle attacks against redirected SSH and HTTPS sessions by exploiting weak bindings in ad-hoc PKI.
-------------
Very helpful network password traffic capture App.
Will accept live feed from a monitoring interface or process network capture file. While a bit dated, it works great for a quick tool to rip open passwords off the wire. It can also write the passwords to file or out to the screen.