Gravwell is described as 'all-you-can-ingest data fusion analytics platform that enables complete context and root cause analytics for security and business data' and is an app in the Security & Privacy category. There are more than 10 alternatives to Gravwell for a variety of platforms, including Linux, Mac, Windows, Self-Hosted solutions and Online / Web-based. The best alternative is Grafana, which is both free and Open Source. Other great apps like Gravwell are Graylog (Free, Open Source), Logstash (Free, Open Source), Splunk (Freemium) and Apache Flink (Free, Open Source).
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.
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.
Alienvault integrates and correlates many popular network and security monitoring tools in one suite, inlcuding OSSEC, nfdump, log analyzers, nagios, and nessus and analyzes it against its own community-driven threat feed.
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.