BixData: Powerful easy to use monitoring
BixData is a handy new tool for SysAdmins. It can monitor everything that your network and systems depend on. After a simple installation you can monitor network devices, HTTP, Web Services, Mail Servers, File Systems and Applications. Be notified instantly when a service or device goes down or escalate notification based on downtime.
Cross-platform and scales to 1000’s of servers.
There is a free version for monitoring under 30 machines.