Top PERFORMANCE GitHub Repositories & Tools (2026)

A diagnostic performance logging utility for macOS: logs CPU, memory, GPU, network, and battery from the menu bar to help detect and diagnose performance issues. Free, open source, no telemetry.

Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation

🤱🏻 Turn any webpage into a desktop app with one command.

Build smaller, faster, and more secure desktop and mobile applications with a web frontend.

Mobile app automation and verification for AI coding agents. CLI, MCP server, and typed Node.js API for iOS, Android, HarmonyOS, TV, web, macOS, and Linux.

Path tracing renderer and utilities for three.js built on top of three-mesh-bvh.

Free Windows, Mac and Linux cleaner, scanner, and more.

📈 A small, fast chart for time series, lines, areas, ohlc & bars

A declarative, efficient, and flexible JavaScript library for building user interfaces.

Open Source HR and Payroll Software

A set of performant RDNA/HIP patches against llama.cpp focusing on high speed inferencing with numerics assurance

Fast and low overhead web framework, for Node.js

Rust profiler for CPU, memory, SQL, HTTP, and async performance, with Prometheus and Grafana support.

⚡️ Express inspired web framework written in Go

Lenovo Legion Toolkit (LLT) is a Windows desktop utility created for Lenovo gaming laptops that replaces Lenovo Vantage, Legion Zone, and Legion Space.

Sudoless Apple Silicon system monitor (native SwiftUI GUI) with ANE / Media Engine / memory-bandwidth tracking

A comprehensive Go handbook for software engineers covering fundamentals, idiomatic Go, concurrency, generics, testing, APIs, databases, performance, microservices, system design, and production engineering.

a fast systems programming language for high-performance software and gamedev: data-oriented, multi-paradigm, null-safe, safety checks, C-like syntax, C interop, native code/JIT via LLVM, C backend

Measure helps mobile teams monitor and fix crashes, ANRs, bugs, and performance issues. The open source alternative to Firebase Crashlytics.

Application Layer DoS attack simulator