Top CHECK GitHub Repositories & Tools (2026)

Offline, privacy-first grammar checker. Fast, open-source, Rust-powered

Get Android app updates straight from the source.

Open firmware for the Echo Show 5, 1st and 2nd gen: Alpine Linux instead of Android, no Alexa. A local Home Assistant voice satellite with its own touch screen, on-device wake word, SSH and A/B over-the-air updates.

The best IP Toolbox. Check your IP address & geolocation, test IP for WebRTC and DNS IP leaks, run an IP quality check, browser fingerprint check, website availability check, network speed test, global latency test, MTR test, Whois search, and more.

Firefly III: a personal finances manager

TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

A fast type checker and language server for Python

Style and Grammar Checker for 25+ Languages

One library | Many payment processors | Scale to multiple processors with few lines of code.

Self-hosted Speed Test for HTML5 and more. Easy setup, examples, configurable, mobile friendly. Supports PHP, Node, Multiple servers, and more

static analysis of C/C++ code

Quick and Easy server testing/validation

Super-fast/easy runtime validators and serializers via transformation

Keep your containers up-to-date!

background code checker

State-of-the-Art Source Code Plagiarism & Collusion Detection. Check for plagiarism in a set of programs.

Static type checker for Ruby

Fast proxy scraper and checker written in Rust. Collects HTTP, SOCKS4 and SOCKS5 proxies from any number of sources, verifies each one really works, and writes JSON and plain text with response time, exit IP, ASN and geolocation. Single binary for Windows, Linux, macOS and Android, with an interactive TUI.

IBM Equal Access Accessibility Checker contains tools to automate accessibility checking from a browser or in a continuous development/build environment

A high-performance proxy rotation engine with automated IP management and real-time health monitoring