Passive network application response time monitor utilising libpcap packet capture. Maintains session state tracking host response, network round-trip times and end-point/network congestion. Can be configured for many protocols such as http, telnet...
Freyr is a resource monitor/dynamic DNS updater that allows dynamically change DNS records for different services depending on their state. So you'll be able to keep only active IP addresses in your DNS database.
Light and simple DynDns update client. Features: start on system start up and IP update on system start up; automatic IP update when IP changes; manual IP update; view current IP