→ Highlight.io [FullStack]

highlight.io: The open source monitoring platform.

→ Open Replay [Frontend]

https://github.com/openreplay/openreplay

→ LogRocket [Frontend]

LogRocket

→ DataDog [FullStack]

Cloud Monitoring as a Service | Datadog

→ Uptime Kuma (self hosted)

Uptime Kuma