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logstash is a tool for managing events and logs. You can use it to collect logs, parse them, and store them for later use (like, for searching). Speaking of searching, logstash comes with a web interface for searching and drilling into all of your logs.

Logmatic.io is an Operations Data Platform for Log and Machine events. We help companies improve their software and business performance by leveraging their machine data.

Graylog is an open source syslog implementation that stores your logs in Elasticsearch. It consists of a server and web interface written in Java that accepts your syslog messages via TCP or UDP (or GELF messages) and stores it in the database.

Fluentd is a fully free and open-source log management tool that simplifies your data collection and storage pipeline. It eliminates the need to maintain a set of ad-hoc scripts.

Grafana provides a powerful and elegant way to create, explore, and share dashboards and data with your team and the world.

Splunk is software that provides unique visibility across your entire IT infrastructure from one place in real time. Only Splunk enables you to search, report, monitor and analyze streaming and historical data from any source. Troubleshoot application problems and investigate security incidents in minutes instead of hours or days, monitor to avoid service degradation or outages, deliver compliance at lower cost and gain new business insights from your IT data.

Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Since its inception in 2012, many companies and organizations have adopted Prometheus, and the project has a very active developer and user community. It is now a standalone open source project and maintained independently of any company.

Capture, view and filter your ASP.net core log events right from your app

May be the coolest cloud based error logger for .NET web applications. Based on the de-facto standard error component ELMAH, logging errors from your webserver requires nothing more than installing a NuGet package.

Loggly is a cloud-based log management service built on top of a powerful search engine. With Loggly, you can collect logs from your servers then quickly search them with an intuitive user interface. We make looking at logs fun again!

Logentries is a cloud-based service for log collection, correlation, and presentation in a meaningful way. Logentries is reliable and extremely scalable service providing real-time alerts, regular-expression search, graphing and visualization for thousands of users.

IQLECT is the creator of Ampere, a real-time big data analytics platform. Various apps for data center infrastructure monitoring, clickstream analysis, log analysis and others can be deployed on the platform.

Nagios Log Server is a powerful enterprise-class log monitoring and management application that allows organizations to quickly and easily view, sort, and configure logs from any source on any given network. Log Server is designed to analyze, collect, and store log data based on custom specifications, and provide users with extended insight into the data on their network's infrastructure.

Harvesters watch log files for changes, send new log messages to the server, which broadcasts to web clients. Log messages are tagged with stream, node, and log level information based on user configuration.