Code Quality GitHub Repositories (2026) · Open Source Tools

SonarQube extension for Visual Studio providing code quality and security feedback directly in the IDE

The most strict (yet practical) ESLint config. 53 plugins. 1405 rules. React, Vue, Node, and pure JS/TS.

Semantic code and security scanner

:relaxed: Linting dotenv files like a charm!

SonarQube plugin for Eclipse providing code quality and security feedback directly in the IDE

Parser and static code analysis tool for PL/SQL and Oracle SQL.

🔧 JetBrains Qodana’s official command line tool

See the invisible structure of your code. Multi-language code quality and architecture analyzer (Go, PHP, Python, Rust...)

Repo Optimizer: Assess git repositories for AI-assisted development readiness. Submit your score!

Duplicates finder for various source code formats.

:whale: Keep an eye on your docker image size and prevent it from growing too big

A PHP code-quality tool

Keeps AI coding agents such as Claude Code, Codex, GitHub Copilot, Gemini CLI and Cursor to the least code that does the job and still works.

The Eclipse Checkstyle plug-in integrates the Checkstyle Java code auditor into the Eclipse IDE. The plug-in provides real-time feedback to the user about violations of rules that check for coding style and possible error prone code constructs.

Check a file's syntax when saving a file (php, ruby, tex ...) with vim

Show svelte-check's Svelte and TypeScript errors in GitHub pull requests and GitLab merge requests: Code Quality reports, Actions annotations and SARIF for code scanning.

A static analyzer for Java, C, C++, and Objective-C

A Static Analyzer for Java Powered by Machine Learning: Identifies Anti-Patterns Begging for Refactoring

Local-first Git diff triage. Turn patches into actionable review checklists in your browser, CLI or GitHub Actions. Zero dependencies, no AI keys, no uploads. By brunnodev.

Reduce the environmental footprint of your software programs with SonarQube