Arpwatch-ng
Big Brother
Cacti
Cisco Adaptive Security Device Manager (ASDM)
Cisco-centric Open Source Community (COSI).
Cisco Monitor Director
Cisco Monitor Manager
Cisco Network Assistant
Cisco’s Security Device Manager (SDM)
CiscoWorks
HP OpenView
Hyperterminal
Kiwi CatTools
Kiwi Syslog Daemon
MRTG
Nagios
Nessus
Netdisco
NetMRI
Paessler Router Traffic Grapher (PRTG)
Putty
RANCID with CVSweb
SecureCRT
SNMP
SolarWinds Engineer’s Toolkits
ssh client eg TeraTerm
Syslog-ng with phpsyslog-ng
tftpd32
tftp server eg Solarwinds
TraffStats
WhatsUp
WinAgents IOS Config Editor
Wireshark/Ethereal
Useful links: Cisco Tools