node-system-stats
Comprehensive library for monitoring system statistics including CPU, memory, disk, network, battery, and process information with time-series monitoring
pidusage
Cross-platform process cpu % and memory usage of a PID
ua-parser-js
Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment
cpu-features
A simple binding to Google's cpu_features library for obtaining information about installed CPU(s)