→ Microsoft Clarity [Frontend] - Free

Microsoft Clarity - Free Heatmaps & Session Recordings

→ PostHog - Free

PostHog - How developers build successful products

→ Sentry [FullStack]

Application Performance Monitoring & Error Tracking Software

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