ZABBIX is an enterprise-class distributed monitoring solution designed to monitor and track performance and availability of network servers, devices, and other IT resources. It supports distributed and Web-based monitoring, auto-discovery, real-time monitoring, SLA assurance, trending, and more.
Performance Co-Pilot (PCP) is a framework and set of services for supporting system-level performance monitoring and performance management. It provides a unifying abstraction for all of the interesting performance data in a system, and allows client applications to easily retrieve and process any subset of that data using a single API. A client-server architecture allows multiple clients to monitor the same host, and a single client to monitor multiple hosts. Archive logging and replay are integrated so that a client application can use the same API to process real-time data from a host or historical data from an archive.
The audit package contains the user-space utilities for creating audit rules, as well as for storing, searching, and generating reports from the audit records generated by the audit subsystem in the Linux 2.6 kernel and higher. It has a real-time plugin interface for event analysis and remote logging of events.
logn (login-notifier) notifies you about logins of other users. It uses the file /var/log/wtmp for this task and scans this file for login of users. When someone logs in (e.g., using ssh, telnet or FTP) an informational line about the login is printed on your console. To ease idling around on a remote machine with firewall/NAT between you and the remote machine, logn outputs an ASCII NUL character every 8 minutes.
svclean is a set of utilities for enhancing svscan and supervise. With these tools, you get clean shutdown (i.e. services are guaranteed to be stopped before their loggers, so no logs are lost) and supervised logging of svscan's and supervise's output (so if the last-resort logger is killed, it can be restarted). These features are practically necessary for running svscan as process 1, but are useful even when svscan does not run as process 1.
Rsyslog is an enhanced multi-threaded syslogd. Among others, it offers support for on-demand disk buffering, reliable syslog over TCP, SSL, TLS, and RELP, writing to databases (MySQL, PostgreSQL, Oracle, and many more), email alerting, fully configurable output formats (including high-precision timestamps), the ability to filter on any part of the syslog message, on-the-wire message compression, and the ability to convert text files to syslog. It is a drop-in replacement for stock syslogd and able to work with the same configuration file syntax.