Passifist is a tool for passive network discovery. It could be used for a number of different things, but was mainly written to discover hosts without actively probing a network. The tool analyzes broadcast traffic and has a plugin architecture through which it dissects and reports services found. Initial version holds support for the following protocols and plugins: CDP, CIM, HSRP, IPX, NETOP, SMB, TFTP.
You can download it from the following link: https://packetstormsecurity.com/files/download/30984/passifist_src_1.0.0.tgz
Source: https://packetstormsecurity.com/files/30984/passifist_src_1.0.0.tgz.html