OpenSearch
OpenSearch Software Foundation (Linux Foundation) · Vector databases
Apache-2.0 search and analytics suite forked from Elasticsearch and Kibana, governed by the OpenSearch Software Foundation
Apache-2.0Open sourceFreeSelf-hostedBroken
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PM2
Keymetrics (Unitech) · Infrastructure & provisioning
Production process manager for Node.js and other long-running programs with cluster mode, log handling, restart policies and boot-time startup scripts
AGPL-3.0-onlyOpen sourceFreeLocalSelf-hostedNov 2, 2026
Prometheus
Prometheus Authors / Cloud Native Computing Foundation · Monitoring & observability
Pull-based metrics monitoring system and time-series database with the PromQL query language, service discovery and the Alertmanager component
Apache-2.0Open sourceFreeSelf-hostedBroken
Uptime Kuma
Louis Lam (open-source project) · Monitoring & observability
Self-hosted uptime monitor with HTTP, TCP, DNS, ping and keyword checks, many notification channels and public status pages
MITOpen sourceFreeSelf-hostedBroken
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