original post can be found on my blog.
Nagios is probably the most famous and used monitoring program on the market. It's free, GPL and has nice features such as object representation of data, inheritance, plugin systems, passive testing, built-in Perl interpreter, result caching, pipe interface, alert delegations and so on and so on.
For that reason, it has always been a bit difficult (though possible) selling Nagios to the enterprise when your boss isn't tech savvy, and other programs, not much better or worse (OpenNMS for instance) find their way since they have a much better user interface.
Apparently, there is a Perl Catalyst-based project to revamp the Nagios web interface, called Thunk. It is available on Github and also has a demo page. It's incredibly fast and seems promising. However, there is no website for it. Currently the only face it has is the Github page which seems generic and perhaps non-welcoming for some people who consider using it. You can also view the demo, but it still has the basic dull look of Nagios' oldschool interface.
Another new project relating to Nagios is Shinken, which is a Python rewrite of Nagios. Apparently someone thought that Nagios is great, except it's written in C, which makes it a barrier to include other peoples' work. I personally disagree for a variety of reasons which I won't go into. What does seem interesting is that Shinken is very welcoming, even though (at least to me) it seems like an exercise in futility. I'm assuming it will rapidly develop a stable core userbase, and the website is to thank, IMHO.
One more issue to note: Ethan Galstad is now developing Nagios XI, an enterprise solution. The "solution" boasts a new web interface, which I suspect will be the leading selling point of it.
Now, of course there's a difference in Python, Perl, C and all that. However, in marketing, the selling value goes to the more presentable. In a System Monitoring conference I would have a pretty difficult time selling anything with just a Github page. It all boils down (in marketing terms) to the interface.