Nibbler is a simple and flexible system monitoring application. It polls services on a specified machines to ensure that they are up and running. It tracks the results of this polling to create uptime and statistical analysis of the servers. Currently it can poll HTTP and SMTP services with many more services planned.
It is a php/mysql application which is designed to be extendable and skinnable is uses valid XHTML and CSS for design and layout and can also plug into other applications via web services.
A flex/actionscript interface is planned for it but currently has not been implemented.
The rough development plan is below but there are no firm dates as I only get to work on it on the ferry to and from work at the moment. If you are interested in this project please let me know at mark at ynchconsulting.com.au.