LibreNMS is an autodiscovering PHP/MySQL-based network monitoring system forked from Observium. It aims to be easy to use and painless to deploy, and to support monitoring of a wide range of devices. Observium's license changed to a modified QPL license in May 2012, then was split into free and commercial versions. The aim of LibreNMS is to continue to create a usable NMS, but with a community focus and GPL licensing.
C-ICAP Classify is a module that allows classification (labeling) of Web pages, images, and soon video based on content. Labels are placed in HTTP headers. Any PIC-Label META tags are exported into HTTP headers. This allows for creation of very flexible filters according to rules defined by the user, using the ICAP enabled proxy's ACLs. It is not a URL filter, so implementing it with sslBump or similar proxy technologies makes it very difficult to bypass. Text classification is done using Fast Hyperspace (based on Hyperspace from CRM114) and/or a Fast Naive Bayes. Image and video (when implemented) use haar feature detection from the OpenCV library.
BGPHist is a tool that receives MP-BGP updates, decodes them, and writes them to a database for logging and monitoring purposes. It supports not only Internet routes, but also IPv4 VPN, IPV6 VPN, and L2VPN. It sounds text output, MySQL databases, and Oracle databases. For the MySQL backend, there is also a simple PHP frontend. It could be used to monitor and log an ISP's customer activity for Internet and VPNs, as a passive BGP looking glass, or as a backend for some external monitoring and accounting system.
jWatchdog delivers a simple watchdog to actively monitor your infrastructure and send you notifications in case something goes wrong. It is configured using a simple XML configuration file. This configuration file can be changed on-the-fly without a need to restart the watchdog. jWatchdog does not offer data collection itself. It assumes that you already collected the data on which you want to run jWatchdog. The de facto standard tool Collectd is recommended for data collection. jWatchdog assumes that you use the RRDTool collectd output plugin to store the collected data in RRD files, or use Graphite as a datasource.
The NSCA-ng package provides a client-server pair which makes the Nagios command pipe accessible to remote systems, with per-client passwords and fine-grained authorization control. This allows for submission of passive check results, downtimes, and many other commands to Nagios (or compatible monitoring solutions). Check results of arbitrary size and multiline plugin output are supported.