Open source. Open possibilities.

Sentry is a developer-first debugging platform for error tracking and performance monitoring, with official SDKs for many languages and frameworks.

A macOS menu bar system monitor displaying CPU, GPU, memory, disk, network, battery, sensor, Bluetooth, and clock information. Supports macOS 12+ with 30+ language translations.

Uptime Kuma is an easy-to-use, self-hosted monitoring tool designed to track the uptime of various services and provide notifications upon failure.

BWLog is a lightweight, self-hosted bandwidth logger for *nix systems written in Go. It monitors incoming and outgoing network traffic on specified interfaces and provides a web frontend with live graphs and historical statistics.

Libre Hardware Monitor is a free, open-source Windows tool that monitors temperature sensors, fan speeds, voltages, load, and clock speeds of computer hardware including motherboards, CPUs, GPUs, storage devices, and network cards.

Interactive Node.js bot that watches ETH/USDC prices across Chainlink, Uniswap V2, SushiSwap, Curve and Balancer, and triggers a flash-loan arbitrage routine through a smart contract when the spread between venues reaches 0.9%.

Tianji is an all-in-one self-hosted platform combining website analytics, uptime monitoring, and server status dashboards. It serves as a lightweight alternative to separate tools like Google Analytics, Uptime Kuma, and Prometheus.