Loggly offers a cloud-based service that mines tons of log data in real time and reveals what matters, so that you have the insights you need to produce quality code and deliver a great user experience.
Logz.io is a Cloud Log Analytics service. Logz.io is powered by crowd sourced machine learning algorithms designed to help customers find the needle in the haystack in their log data.
Logstash is a data pipeline that helps you process logs and other event data from a variety of systems. With 200 plugins and counting, Logstash can connect to a variety of sources and stream data at scale to a central analytics system.
Splunk is a software for searching, monitoring, and analyzing machine-generated big data, via a web-style interface. It captures indexes and correlates real-time data in a searchable repository from which it can generate graphs, reports, alerts, dashboards and visualizations.