* [WebPerf Snippets v1.2.0](https://github.com/nucliweb/webperf-snippets) – Curated collection of JavaScript snippets to measure and debug web performance from the browser DevTools console.

* [Elastic APM Real User Monitoring (RUM) JavaScript agent @elastic/apm-rum@5.1...](https://github.com/elastic/apm-agent-rum-js) – Browser-side agent that captures user performance metrics, errors, and transactions and sends telemetry to a monitoring backend.