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You can use nagios check plugins, but it's a completely new, and IMO much better designed code base.
Getting a "Heroku | No such app" on the .com version...
Just in case anyone's confused (I was :-p )
http://www.observium.org/wiki/Developing_for_Observium#Licen...
http://opensource.org/licenses/QPL-1.0
So not totally sucky, it's still open source and free beer.
Many prefer Cacti to Zabbix because the latter is clunky and confusing compared to Cacti's simple straightforward approach with plugins.
But I am actually wondering, how alive is Cacti now, because its releases are constantly postponed, and forum is not as alive as it used to be.
It took about 3 months for me to build a monitoring solution from scratch with Zabbix for a little over 100 devices, with just a single vCPU VMware VM for both Zabbix and its MySQL database. Monitored devices included Windows, Linux and AIX machines, but also a couple of large UPSes and a few server rack PDUs.
This was my first contact with Zabbix and during this time I wrote dozens of agent scripts to monitor stuff ranging from DB2 and Microsoft Exchange clusters to physical disks and SAN LUNs.
It's one of a select few software packages that I can say that I really like. It works as expected and it's pretty extensible.
His "release" from being a core nagios developer is another interesting story, he talks about it some here (some nsfw language: http://www.youtube.com/watch?v=YgbbyyNIiHc
The bigger concern is that the new maintainers have no reputation and no proven track recording quality, commitment, skills or experience on this project. I would not be happy accepting updates from them.
Anybody who really thought about it for a bit, must have known that Nagios LLC would eventually seize control of anything Nagios trademark related.
This outcome and the way it happened should surprise no one.
http://www.youtube.com/watch?v=gb_qHP7VaZE (some NSFW language)