A set of guidelines for a specific programming language that recommend programming style, practices, and methods for each aspect of a program written in that language.

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• Programming Languages
• Development Environment
• Platforms
• Frameworks
• Content Management System
• Tools
• Contributors

• BF Style Guide

• NASA C++ Coding Standards and Style Guide
• C Coding Standard
• C Programming/Structure and style

• C# Coding Conventions
• C# Style Guide
• C# Coding Standards and Naming Conventions

• Google C++ Style Guide
• C++ Core Guidelines - A set of tried-and-true guidelines, rules, and best practices about coding in C++.

• The Clojure Style Guide - A community coding style guide for the Clojure programming language.

• Style Guide
• Google Common Lisp Style Guide
• Common Lisp Style Guide

• The D Style - A set of style conventions for writing D programs.

• Effective Dart

• Elixir Styleguide

• Elm style guide

• Programming Rules and Conventions
• Erlang Coding Guidelines

• The F# Component Design Guidelines

• Fortran 90 Standards - European Standards For Writing and Documenting Exchangeable Fortran 90 Code.

• Effective Go

• Apache Groovy style guide

• Haskell Programming guidelines

• Code Conventions for the Java™ Programming Language
• Google Java Style Guide - Google's coding standards for source code in the Java™ Programming Language.
• Java Programming Style Guide
• Alibaba-Java-Coding-Guidelines - A guide for Java developers.

• AngularJS Style Guide - Community-driven set of best practices for AngularJS application development.
• JavaScript The Right Way - An easy-to-read, quick reference for JS best practices, accepted coding standards, and links around the Web.
• Google JavaScript Style Guide - This document serves as the complete definition of Google's coding standards for source code in the JavaScript programming language.
• Airbnb JavaScript Style Guide - A mostly reasonable approach to JavaScript.
• jQuery Core Style Guide
• JavaScript Style Guides And Beautifiers
• JavaScript Style Guide and Coding Conventions
• Code Conventions for the JavaScript
• JavaScript Clean Code - Software engineering principles, from Robert C. Martin's book Clean Code, adapted for JavaScript.

• Google JSON Style Guide

• Coding Conventions

• Lua Style Guide

• Google Markdown Style Guide - Style guide for Google-originated projects using Markdown.
• Markdown Style Guide

• .NET Standard
• .NET Secure Coding Guidelines
• .NET Naming Guidelines

• Objective-C Style guide - Style guide & coding conventions for Objective-C projects.
• Google Objective-C Style Guide
• NYTimes Objective-C Style Guide - The Objective-C Style Guide used by The New York Times.

• Coding style

• Perl best practices v4 - Slides by Randal Schwartz, based on the book by Damian Conway.
• Perl Elements to Avoid - A list of unrecommended practices, and what to do instead.
• perlstyle

• PHP FIG - PHP Standards Recommendations.
• PHP The Right Way - An easy-to-read, quick reference for PHP best practices, accepted coding standards, and links to authoritative tutorials around the Web.
• Clean Code PHP - Clean Code concepts adapted for PHP.

• Style Guide for Python Code
• Google Python Style Guide
• The Hitchhiker's Guide to Python - Highly regarded Python best practices guide.

• Google's R Style Guide
• The tidyverse style guide

• How to Program Racket: a Style Guide

• The Ruby Style Guide - A community-driven Ruby coding style guide.
• Ruby Style Guide - Airbnb's Ruby Style Guide.
• Ruby Style Guide - A community-driven Ruby coding style guide.

• Rust Style Guide
• Rust Guidelines

• Scala Style Guide
• Databricks Scala Guide - Databricks Scala Coding Style Guide.
• Scala Best Practices

• API Design Guidelines
• Swift - GitHub Official Swift style and conventions.
• Swift style guide
• Swift Style Guide - LinkedIn Official Swift Style Guide.
• Metova's Swift style guide
• Xmartlabs Swift Style Guide - Swift language style guide & coding conventions followed by Xmartlabs.

• Visual Basic Concepts
• Visual Basic/Coding Standards

• Google XML Document Format Style Guide

• Shell Style Guide

• Git Style Guide
• Few Rules from Git Documentation

• The PowerShell Best Practices and Style Guide - The Unofficial PowerShell Best Practices and Style Guide.

• Android Guidelines - Architecture and code guidelines we use at ribot when developing for Android.
• Xmartlabs Android Style Guide - Style guide for Android by Xmartlabs.

• Apache Developers' C Language Style Guide

• HAL - A simple format that gives a consistent and easy way to hyperlink between resources in your API.
• Microsoft REST API Guidelines - The Microsoft REST API Guidelines.
• JSON API - Recommendations - This section contains recommendations for JSON API implementations.
• API Security Checklist - Checklist of the most important security countermeasures when designing, testing, and releasing your API.

• Arduino style guide
• API Style Guide for Arduino

• CSS Guidelines - High-level advice and guidelines for writing sane, manageable, scalable CSS.
• Frontend Guidelines - Some HTML, CSS and JS best practices.
• Sass Guidelines - An opinionated styleguide for writing sane, maintainable and scalable Sass.
• Airbnb CSS / Sass Styleguide - A mostly reasonable approach to CSS and Sass.
• HTML Style Guide - A style guide which helps you write better, performant, structured, scalable and maintainable HTML.
• HTML + CSS Code Guide - Standards for flexible, durable, and sustainable HTML and CSS.
• U.S. Web Design Standards - Open source UI components and visual style guide for U.S. government websites.
• CoffeeScript Style Guide - A collection of best-practices and coding conventions for the CoffeeScript programming language.
• LESS Coding Guidelines
• Google HTML/CSS Style Guide
• Guidelines for Responsive Web Design
• Yelp Styleguide
• Ambassador Conventions - A UX and design pattern library for all Ambassador apps.
• Front-End Checklist

• GNU coding standards
• Making The Best Use of C - This chapter provides advice on how best to use the C language when writing GNU software.

• JavaEE Specification

• Linux kernel coding style

• Mailchimp Content Style Guide

• Mozilla Coding Style Guide

• npm-coding-style
• Microsoft + Node.js Guidelines
• Node.js Style Guide - A guide for styling your Node.js / JavaScript code.

• Mongo Style Guide

• SQL Style Guide

• Keep a CHANGELOG - Don't let your friends dump git logs into CHANGELOGs™.
• Project Guidelines - A set of best practices for JavaScript projects.
• Semantic Versioning
• Indent style
• WebAppSec/Secure Coding Guidelines
• Robot Framework User Guide

• Symfony Coding Standards
• Django Coding Style

• WordPress Coding Standards
• Drupal Coding Standards

• JavaScript Standard Style - One JavaScript Style to Rule Them All.
• Checkstyle - Tool for checking Java source code for adherence to a Code Standard or set of validation rules.
• Conventional Changelog
• semantic-release
• North - Design and development standards to align and guide your project.
• EasyCodingStandard - The Easiest Way to Use Any Coding Standard.
• PHP Coding Standards Fixer - The PHP Coding Standards Fixer (PHP CS Fixer) tool fixes your code to follow standards.
• RuboCop - A Ruby static code analyzer and formatter, based on the community Ruby style guide.

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