Kafka - A high-throughput distributed messaging system

•    Java

Kafka provides a publish-subscribe solution that can handle all activity stream data and processing on a consumer-scale web site. This kind of activity (page views, searches, and other user actions) are a key ingredient in many of the social feature on the modern web. This data is typically handled by "logging" and ad hoc log aggregation solutions due to the throughput requirements. This kind of ad hoc solution is a viable solution to providing logging data to Hadoop.

Clarity - Web interface for the grep

•    Ruby

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.

LogTrail - Log Viewer plugin for Kibana

•    Javascript

LogTrail is a plugin for Kibana to view, analyze, search and tail log events from multiple hosts in realtime with devops friendly interface inspired by Papertrail.

Graylog2 - Open Source Log Management

•    Java

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.

X-Itools: Enterprise Collaboration

•    Javascript

Enterprise Collaboration modules and strong Log Analysis modules

White-elephant - Hadoop log aggregator and dashboard

•    Java

White Elephant is a Hadoop log aggregator and dashboard which enables visualization of Hadoop cluster utilization across users. The server is a JRuby web application. In a production environment it can be deployed to tomcat and reads aggregated usage data directly from Hadoop. This data is stored in an in-memory database provided by HyperSQL. Charting is provided by Rickshaw. This project is developed by LinkedIn.

GoAccess - Real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through your browser

•    C

GoAccess is an open source real-time web log analyzer and interactive viewer that runs in a terminal on *nix systems or through your browser. It provides fast and valuable HTTP statistics for system administrators that require a visual server report on the fly. It supports nearly all web log formats (Apache, Nginx, Amazon S3, Elastic Load Balancing, CloudFront, etc)

Chainsaw - log viewer and analysis tool

•    Java

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.

Sawbuck - Log viewer and controller for Windows Chrome logging

•    C++

Sawbuck is a log viewer and controller for Windows Chrome logging, and for other applications or plugins that use the logging facility in Chrome base. Logging in Chrome is integrated with Event Tracing for Windows (ETW), which allows ETW controllers like Sawbuck to control log verbosity at runtime. The Chrome logging integration also captures the call stack at the logging site, which can then be resolved and displayed by log viewers such as Sawbuck.

Fluentd - Data collector, Log Everything in JSON

•    Ruby

Fluentd is an event collector system. It is a generalized version of syslogd, which handles JSON objects for its log messages. It collects logs from various data sources and writes them to files, database or other types of storages.

nxlog - Multi platform Log management

•    C

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.

Scribe - Real time log aggregation used in Facebook

•    C++

Scribe is a server for aggregating log data that's streamed in real time from clients. It is designed to be scalable and reliable. It is developed and maintained by Facebook. It is designed to scale to a very large number of nodes and be robust to network and node failures. There is a scribe server running on every node in the system, configured to aggregate messages and send them to a central scribe server (or servers) in larger groups.

Logsandra - log management using Cassandra

•    Python

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.

oklog - A distributed and coördination-free log management system

•    Go

I hoped to find the opportunity to continue developing OK Log after the spike of its creation. Unfortunately, despite effort, no such opportunity presented itself. Please look at OK Log for inspiration, and consider using the (maintained!) projects that came from it, ulid and run. OK Log is a distributed and coördination-free log management system for big ol' clusters. It's an on-prem solution that's designed to be a sort of building block: easy to understand, easy to operate, and easy to extend.

Flume - Log management using HDFS

•    Java

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.

SSIS Event Log Business Intelligence

The SSIS Event Log Business Intelligence package is a complete BI project focused around SSIS Event Log data. Components include: - 9 SSRS Reports - ETL Data Mart - SSIS packages to load ETL Data Mart - Analysis Services Cube - PerformancePoint Dashboard

BlackBox Event Log Framework

BlackBox Event Log Framework is a easy to understand, use, extend and multiple platform event logging framework.

Log2Console - A Generic Log Viewer (for Log4Net, NLog...)

•    CSharp

Log2Console is a development tool offering a nice UI to display, filter and search log messages from different logging services: Log4Net, Log4j and NLog. It can directly receive log events locally or remotely, or read them from a log file... It is written with C#.

eventsourced - A library for building reliable, scalable and distributed event-sourced applications in Scala

•    Javascript

In other words, Eventsourced implements a write-ahead log (WAL) that is used to keep track of messages an actor receives and to recover its state by replaying logged messages. Appending messages to a log instead of persisting actor state directly allows for actor state persistence at very high transaction rates and supports efficient replication. In contrast to other WAL-based systems, Eventsourced usually keeps the whole message history in the log and makes usage of state snapshots optional. Logged messages represent intended changes to an actor's state. Logging changes instead of updating current state is one of the core concept of event sourcing. Eventsourced can be used to implement event sourcing concepts but it is not limited to that. More details about Eventsourced and its relation to event sourcing can be found at How does Eventsourced persist actor state and how is this related to event sourcing.

SharePoint Logging Library By Ayman El-Hattab

This library helps you writing code that incorporates logging to SharePoint logs. Writing to the same trace log alleviates the need for developers to log their development information in other places such as the Windows Event Log which is commonly used by system administrators.