Dejal Systems (www.dejal.com/simon) has released version 3.5 of Simon, its server monitoring tool for Mac OS X. It checks websites and many other kinds of services for changes or failures, with lots of notification and reporting options.
Version 3.5 includes a number of improvements and fixes for OS X 10.8 (Mountain Lion) support. It also includes improvements to the Web (HTTP) Twitter, Calendar, Script, Email and Speech plug-ins.
Dejal Simon 3.5 costs US$49 for new users; a full-featured demo is available for download. This is a free update for licensed Simon 3 users; upgrades from version 2 start at $19.