"a self-hosted, lightweight web application and server monitoring toolkit. It provides you with straightforward visualisation of essential server data. It helps you manage the errors that occur in your web applications and makes logging complex datastructures and searching in your log data easy"

"Application Performance Management for the Cloud Generation - Java/.NET"

A question for the Haskell gurus out there, particularly @donsbot and @bos31337:

"a status dashboard for APIs and software services"

"a Linux server monitoring app for iPhone & iPod Touch that talks to your server via SSH protocol"

"a fresh, novel approach to web and systems monitoring"

"A single unified interface to manage your Amazon Web Services environment - S3, EC2, SQS and SDB". $50/month.

A nice elaboration on the Down For Everyone Or Just Me theme.

"monitors a logfile for specific events. To do this it uses a bayesian filter to determine what events are worth passing through and which should be suppressed."

"The system statistics collection daemon." Like Ganglia but less so?

"a highly scalable real-time graphing system"

"a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems"

Monitoring and reporting with a Ruby/Rails bent. Not yet launched.

For every time this has been asked in a chat room, IRC channel, forum, office, over IM, or on Twitter: an answer. A solution.

tips for performing basic monitoring tasks on Amazon EC2 virtual machines using Ruby

"The industry standard data logging and graphing application."

Manage AWS. Built on Rails!

"a sub-set of the intelligence derived from the ATLAS sensor network on host/port scanning activity, zero-day exploits and worm propagation, security events, vulnerability disclosures and dynamic botnet and phishing infrastructures"