Bugfender!

Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them. JavaScript, Ruby, Python, PHP, Node.js, Android, Flash, .NET, and Java libraries are available.

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.

Hosted log management for servers, apps, and cloud services. Papertrail aggregates syslog, Text log files, Apache, MySQL, cloud hosting, Ruby on Rails, Windows events, Tomcat, Heroku apps, and routers & firewalls.

Real time, actionable insights into your log analytics data with ELK as a service.

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.

RootCause provides you with a comprehensive set of tools to monitor and reproduce errors in web sites/applications. Using the built-in recorder feature you’ll know exactly what the user did. After an error has been logged, head over to the web-based Replay Studio where you can replay the session to reproduce the error with one click.

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.