prometheus/jmx_exporter

Netdata is an open-source Agent that turns a Linux, macOS, FreeBSD, or Windows host into a self-monitoring node: per-second metrics, anomaly detection trained locally per metric, and an auto-generated dashboard, all running before you ever connect to Netdata Cloud.

CS-Notes is a GitHub repository maintained by CyC2018 that collects Chinese-language study notes across ten topic areas: algorithms, operating systems, networking, object-oriented design, databases, Java, system design, tools, coding practice, and an afterword. It links each topic to standalone markdown files instead of writing everything inline, and the README says most of the content is original work rather than material copied from elsewhere.

Java Design Patterns is an open-source GitHub project by iluwatar that documents design patterns as commented, working Java code rather than diagrams or prose. The repository is organized so readers can find a pattern by name, by tag such as Gang of Four or Performance, or by category, with a companion site and an optional paid e-book alongside it.

Uptime Kuma is a self-hosted monitoring application from louislam, built with Vue 3 and Socket.IO, that tracks uptime for HTTP(s), TCP, DNS, ping, WebSocket, and Docker container targets from one web dashboard. It sends alerts through Telegram, Discord, Gotify, Slack, Pushover, and SMTP email, among more than 90 notification services, and the project is MIT-licensed with 90,144 GitHub stars.