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Octopussy is a solution to manage your logs (also frequently called a SIM/SEM/SIEM Solution). Basically, it stores your logs, produces reports, and raises alerts.

syslog-ng is a syslogd replacement for a wide variety of UNIX systems that supports IPv6 and is capable of transferring log messages reliably using TCP and SSL and filtering the content of messages using regular expressions. Both RFC3164 and RFC5424 style messages are handled, but more esoteric formats like BSD process accounting logs are supported too. Apart from regular text files, it supports storing messages into SQL and MongoDB databases, and forward messages to local processes via pipes or UNIX domain sockets. This makes syslog-ng ideal as an integration platform. syslog-ng supports extracting structured information from the traditionally text based syslog via csv-parser(), db-parser(), and patterndb. Tag based classification, rewriting messages, and outputting messages in JSON is also possible. This makes syslog-ng ideal for preprocessing events for further analysis, be that home-grown scripts or SIEM systems. syslog-ng scales well on today's multi processor and multi-core systems: reaching 1,000,000 messages per second is a reality for the simplest use cases.

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.

Jailkit is a set of utilities to allow quick creation of
limited user accounts in a chroot jail. It contains a safe logging daemon, shells that can restrict users, utilities to start daemons in a chroot jail, and utilities for easy setup of chroot jails.

fwsnort translates snort rules into an equivalent
iptables ruleset. By making use of the iptables
string match module, fwsnort can detect
application layer signatures which exist in many
snort rules. fwsnort adds a --hex-string option to
iptables, which allows snort rules that contain
hex characters to be input directly into iptables
rulesets without modification. In addition,
fwsnort makes use of the IPTables::Parse Perl
module in order to (optionally) restrict the snort
rule translation to only those rules that specify
traffic that could potentially be allowed through
an existing iptables policy.

Bandwidth Management Tools is a total bandwidth
management solution for Linux and can be used for firewalling, traffic graphing, and shaping. It is not based on any currently-available bandwidth management software and supports packet queues, bursting, complex traffic flow hierarchies, flow groups, traffic logging, and a simple real-time monitoring front-end.