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signoz
SigNoz is an open-source observability platform native to OpenTelemetry with logs, traces and metrics in a single application. An open-source alternative to DataDog, NewRelic, etc. 🔥 🖥. 👉 Open source Application Performance Monitoring (APM) & Observability tool
SigNoz positions itself as an "open-source DataDog alternative". You can host it yourself or use the commercial cloud version.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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As of this writing, Elasticsearch is again open-source.
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Wireshark
Read-only mirror of Wireshark's Git repository at https://gitlab.com/wireshark/wireshark. ⚠️ GitHub won't let us disable pull requests. ⚠️ THEY WILL BE IGNORED HERE ⚠️ Upload them at GitLab instead.
Now we are getting a bit low-level. WireShark is a network protocol analyzer that has been around for a long time.
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
Grafana is open-source and also has a managed version. You can query both metrics and logs. It has a very active community. You can set up and try Grafana on your local machine easily using Docker.
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VictoriaMetrics is a monitoring tool and time series database. It is open-source and has a managed version.
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parseable
Open Source ElasticSearch Alternative. Parseable helps you search and get insights from your logs in the most simple way possible.
Parseable is a managed log analytics solution that also has an open-source version. It's written in Rust. Parseable can use either Parquet or the Arrow format for storage. Both Arrow and Parquet are Apache open-source column-oriented data storage formats.
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Apache SkyWalking is an open-source APM tool meant for distributed systems. It has support for distributed tracing, agents in multiple languages, and support for an eBPF agent.
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Sentry is an open-source error tracking and performance monitoring tool that also has a managed version.