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.
Observium is an autodiscovering network monitoring system focused primarily on Cisco and Linux networks but includes support for a wide range of network hardware and operating systems. Observium has grown out of a lack of easy to use NMSes. It is intended to provide a more navigable interface to the health and performance of your network. Its design goals include collecting as much historical data about devices as possible, being completely autodiscovered with little or no manual intervention, and having a very intuitive interface.
ida-syslog is a Web-based viewer for syslog data. It requires syslog data in a MySQL database. It uses AJAX and is based on jQuery and PHP. It is intended for use with rsyslog-mysql, but can be adapted to any table format via the config file. It has a fast UI with no page reloads, and can save search settings as templates for easy reuse. Tail mode and auto-loading of older entries when scrolling down. Fixes for use with Windows-Syslog-Tools (NTSyslog2, Snare).