Thanos.io - Open source, highly available Prometheus setup with long term storage capabilities.

eG Enterprise - From application performance to user experience to infrastructure usage, get performance answers from a single console. Troubleshoot fast with actionable insights.

InsightCat - Full-stack monitoring platform for your software and hardware. InsightCat is a cloud-based and AI-powered solution to enhance your system health estate through infrastructure monitoring and alerting capabilities.

NinjaOne - NinjaOne (Formerly NinjaRMM) provides remote monitoring and management software that combines powerful functionality with a fast, modern UI. Easily remediate IT issues, automate common tasks, and support end-users with powerful IT management tools.

Site24x7 - Site24x7 offers both free & paid website monitoring services. Monitor websites remotely and receive instant email/sms alerts if your website becomes unavailable. View uptime & performance graphs of your website monitors.

OpenTracing - Consistent, expressive, vendor-neutral APIs for distributed tracing and context propagation.