Splunk is described as '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' and is an app in the Network & Admin category. There are more than 50 alternatives to Splunk for a variety of platforms, including Linux, Windows, Online / Web-based, Mac and Self-Hosted solutions. The best alternative is Grafana, which is both free and Open Source. Other great apps like Splunk are Prometheus (Free, Open Source), Graylog (Free, Open Source), Sematext Logs (Freemium) and Datadog (Paid).
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.
Most users think AlienVault is a great alternative to Splunk.
Prelude is a Universal Security Information & Event Management (SIEM) system. It collects, normalizes, sorts, aggregates, correlates and reports all security-related events independently of the product brand or license giving rise to such events.
Logit.io is used for a wide variety of use cases including log management, business intelligence, SIEM, APM, container monitoring, infrastructure monitoring, monitoring website uptime, measuring sales performance @ vulnerability scanning.
Timber is a beautiful, fast, modern cloud-based logging system designed specifically for developers and applications. Including built in features like tailing a user, tracing HTTP requests, live tailing, automatic context & structuring, and more!.
Seq is a self-hosted server application used to collect and search application log events. Its deeply-integrated query language and JSON-focused data model intended to scale smoothly from simple log searches to complex diagnostic and analytic tasks.