Dejal Systems has announced Simon 4.1 (http://tinyurl.com/ydovrx), an update to the server monitoring tool for Mac OS X.
Simon checks web pages, FTP and DNS servers, local or remote ports or volumes, and many other kinds of services for changes or failures. HTML reports allow remote viewing of a summary and/or details of Simon monitoring. Version 4.1 includes a redesigned web feature, the ability to send custom headers and load dynamic content, and more.
Simon 4.1 requires Mac OS X Yosemite. It costs US$99, though it’s a free upgrade for registered users of version 4.0. Upgrades from version 3.x are $49. A demo is available for download.