Apache Kafka
Apache Software Foundation · Messaging & queues
Distributed event streaming platform with durable, partitioned, replayable logs, Kafka Connect connectors and Kafka Streams processing
Apache-2.0Open sourceFreeSelf-hostedNov 2, 2026
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ClickHouse
ClickHouse, Inc. · Analytical engines & OLAP
Open-source columnar OLAP database server for fast aggregations over billions of rows, with MergeTree storage, SQL and a managed ClickHouse Cloud
Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026
Grafana
Grafana Labs · Monitoring & observability
Dashboarding and alerting platform that visualizes metrics, logs and traces from Prometheus, SQL databases and dozens of other data sources
AGPL-3.0-onlyOpen sourceFreemiumSelf-hostedNov 2, 2026
LiteLLM
BerriAI · Prompting, evaluation & observability
Open-source Python SDK and self-hosted AI gateway that calls 100+ LLM providers in the OpenAI format, with routing, fallbacks, virtual keys, budgets, spend tracking and logging callbacks
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
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
tmux
tmux project (Nicholas Marriott) · Terminals & shells
Terminal multiplexer that keeps shell sessions alive on a server, splits a terminal into windows and panes, and lets sessions be detached and reattached
ISCOpen sourceFreeLocalSelf-hostedNov 2, 2026
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