Top CHECK GitHub Repositories & Tools (2026)

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

Get Android app updates straight from the source.

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

This tap actively maintains updated casks, hosts apps removed from homebrew/cask due to gatekeeper, and welcomes unsigned releases from community developers.

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

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.

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

Community curated list of templates for the nuclei engine to find security vulnerabilities.

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

Patch-level verification for Bundler

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

Static type checker for Ruby