nxlog is a modular, multi-threaded, high-performance log management solution with multi-platform support. In concept it is similar to syslog-ng or rsyslog but is not limited to unix/syslog only. It can collect logs from files in various formats, receive logs from the network remotely over UDP, TCP or TLS/SSL . It supports platform specific sources such as the Windows Eventlog, Linux kernel logs, Android logs, local syslog etc. 
 Writing and reading logs to/from databases is also supported. The collected logs can be stored into files, databases or forwarded to a remote log server using various protocols. The old BSD Syslog and the newer IETF syslog standard is fully supported by nxlog in addition to other custom formats. A key concept in nxlog is to be able to handle and preserve structured logs so there is no need to convert everything to syslog and then parse these logs again at the other side. It has powerful message filtering, log rewrite and conversion capabilities.

nxlog is a modular, multi-threaded, high-performance log management solution with multi-platform support. In concept it is similar to syslog-ng or rsyslog but is not limited to unix/syslog only. It can collect logs from files in various formats, receive logs from the network remotely over UDP, TCP or TLS/SSL . It supports platform specific sources such as the Windows Eventlog, Linux kernel logs, Android logs, local syslog etc.

nxlog - Multi platform Log management

Graylog2 is an open source log management solution that stores your logs in ElasticSearch. It consists of a server written in Java that accepts your syslog messages via TCP, UDP or AMQP and stores it in the database. The second part is a web interface that allows you to manage the log messages from your web browser. Take a look at the screenshots or the latest release info page to get a feeling of what you can do with Graylog2. 

Graylog2 - Open Source Log Management

Sentry is a realtime event logging and aggregation platform. It specializes in monitoring errors and extracting all the information needed to do a proper post-mortem without any of the hassle of the standard user feedback loop.

Sentry - Realtime Platform-Agnostic Error Logging and Aggregation platform

Octopussy is a Log analyzer tool. It analyzes the log, generates reports and alerts the admin. It has LDAP support to maintain users list. It exports report by Email, FTP & SCP. Scheduled reports could be generated. RRD tool to generate graphs. 

 It is capable to parse the logs generated from lots of services such as Bind, Cisco Router, Cisco Switch, DenyAll Reverse Proxy, Drbd, F5 BigIP, Fortinet FW, Ironport MailServer, Linux Kernel/System, Linux IPTables, Monit, MySQL, Nagios, NetApp NetCache, Juniper Netscreen FW, Juniper Netscreen NSM, Postfix, PostgreSQL, Samhain, Snmpd, Squid, Sshd, Syslog-ng, Windows Snare Agent, Xen etc.

Octopussy is a Log analyzer tool. It analyzes the log, generates reports and alerts the admin. It has LDAP support to maintain users list. It exports report by Email, FTP & SCP. Scheduled reports could be generated. RRD tool to generate graphs.

Octopussy - Perl/XML Logs Analyzer, Alerter & Reporter

Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log data. It has a simple and flexible architecture based on streaming data flows. It is robust and fault tolerant with tunable reliability mechanisms and many failover and recovery mechanisms. It uses a simple extensible data model that allows for online analytic application.

Flume - Log management using HDFS

Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Fluentd helps you unify your logging infrastructure. Fluentd can be used to tail access/error logs and transport them reliably to remote systems. It can "grep" for events and send out alerts. It can function as middleware to enable asynchronous, scalable logging for user action events.
 
Fluentd tries to structure data as JSON as much as possible: this allows Fluentd to unify all facets of processing log data: collecting, filtering, buffering, and outputting logs across multiple sources and destinations (Unified Logging Layer). The downstream data processing is much easier with JSON, since it has enough structure to be accessible while retaining flexible schemas.

Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. Fluentd helps you unify your logging infrastructure. Fluentd can be used to tail access/error logs and transport them reliably to remote systems. It can "grep" for events and send out alerts. It can function as middleware to enable asynchronous, scalable logging for user action events.

Fluentd - Unified Logging Layer

Chainsaw is a companion application to Log4j written by members of the Log4j development community. Chainsaw can read log files formatted in Log4j's XMLLayout, receive events from remote locations, read events from a DB, it can even work with the JDK 1.4 logging events. 

 It has dynamic and powerful filterting which helps to locate stuff easier(e.g. "LOGGER == 'com.mycompany' &amp;&amp; LEVEL == ERROR" ).

Chainsaw is a companion application to Log4j written by members of the Log4j development community. Chainsaw can read log files formatted in Log4j's XMLLayout, receive events from remote locations, read events from a DB, it can even work with the JDK 1.4 logging events.

Chainsaw - log viewer and analysis tool

Clarity is a Splunk like web interface for your server log files. It supports searching (using grep) as well as trailing log files in realtime. It has been written using the event based architecture based on EventMachine and so allows real-time search of very large log files.

Clarity - Web interface for the grep

Logsandra is a log management application written in Python and using Cassandra as back-end. It is written as demo for cassandra but it is worth to take a look. It provides support to create your own parser. Logsandra consists of two main scripts logsandra-httpd.py and logsandra-monitord.py. logsandra-httpd should run on one server and logsandra-monitord should run on all servers producing log files. Logsandra-monitord will send the data to the specified Cassandra Cluster.

Logsandra is a log management application written in Python and using Cassandra as back-end. It is written as demo for cassandra but it is worth to take a look. It provides support to create your own parser.

Logsandra - log management using Cassandra

Epylog is a syslog parser which runs periodically, looks at your logs, processes some of the entries in order to present them in a more comprehensible format, and then mails you the output. It is written specifically for large network clusters where a lot of machines (around 50 and upwards) log to the same loghost using syslog or syslog-ng. It publishes reports to a file with optional notification via email.

Epylog is a syslog parser which runs periodically, looks at your logs, processes some of the entries in order to present them in a more comprehensible format, and then mails you the output. It is written specifically for large network clusters where a lot of machines (around 50 and upwards) log to the same loghost using syslog or syslog-ng.

Epylog - a Syslog parser 

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