Sting is a simple, host-based approach to detecting arp cache poisoning based man in the middle attacks (such as made by ettercap) on your LAN. It uses SNMP to periodically query the arp cache of your router and make sure its entry for you is correct.
Generic clustering/load-balancing platform (over a LAN or internet) using java based P2P Aorta workers that execute java "tasklets". Various tasklets can be implemented to solve fractals, process images, render webpages, crack RSA "brute force".