Google HTML/CSS Style Guide

by Google

Principles of writing consistent, idiomatic CSS

(cc) - Principles of writing consistent

HTML and CSS code guide

General CSS notes, advice and guidelines

Principles of writing idiomatic Sass

Sass Style Guide

Sass Guidelines

An opinionated styleguide for writing sane, maintainable and scalable Sass.

Google HTML/CSS Style Guide

by Google

HTML and CSS code guide

(Site, MIT) - Standards for flexible, durable, and sustainable HTML and CSS

Google XML Document Format Style Guide

XML formatting and style guidance.

C Code Style Guidelines

ESA Style Guide for 'C' coding

Google C++ Style Guide

C++ coding standards and best practices.

C++ Core Guidelines

"Official" set of C++ guidelines, reviewed by the author of C++.

C# Coding Conventions

Official C# coding style conventions.

Framework Design Guidelines

Clojure Style Guide

A community coding style guide for the Clojure programming language.

CoffeeScript Style Guide

A collection of best-practices and coding conventions for the CoffeeScript programming language.

Elixir Style Guide

A community-driven style guide for Elixir.

Go Code Review Comments

List of projects on the Go community wiki.

Haskell Programming Guidelines

Best practices for Haskell programming.

Google JavaScript Style Guide

Principles of Writing Consistent, Idiomatic JavaScript

(cc) - Principles of Writing Consistent, Idiomatic JavaScript

Airbnb JavaScript Style Guide

(MIT) - A mostly reasonable approach to JavaScript

JavaScript: The Right Way

An easy-to-read, quick reference for JS best practices, accepted coding standards, and links around the Web.

ES6 Coding Style

JavaScript SDK Design Guide

Project Guidelines

A set of best practices for JavaScript projects.

Google Java Style

Google's coding standards for source code in the Java™ Programming Language.

Google Objective-C Style Guide

NYTimes Objective-C Style Guide

(MIT) - This style guide outlines the coding conventions of the iOS teams at The New York Times.

The official raywenderlich.com Objective-C style guide

PHP: The Right Way

A PHP best practice quick reference guide.

PHP Standard Recommendations

PEP 8 - Style Guide for Python Code

Official Python style guide (PEP 8).

Google Python Style Guide

is a style guide of dos and don’ts used in Google Python programs. Useful to set some guidelines on how you write code.

Ruby Style Guide

A community-driven Ruby coding style guide.

Ruby Style Guidelines

Rust Style Guide

(Site, MIT) - Official Guide for Rust

Scala Style Guide

Effective Scala

Best practices and patterns for Scala.

Google Shell Style Guide

Scripting with style

SQL Style Guide

SQL style and formatting guidelines.

The Official Kodeco Swift Style Guide

Raywenderlich guide, a must read.

Google Vimscript Style Guide

AngularJS Style Guide

(MIT) - Angular Style Guide: A starting point for Angular development teams to provide consistency through good practices

An AngularJS Style Guide for Closure Users at Google

Better Specs { rspec guidelines with ruby }

RSpec Style Guide

Even Better Specs | Guidelines for Maintainable Tests

Rails Style Guide

Community-driven Rails best practices and style for Rails 3 and 4.

The official style guide for Vue-specific code

HTTP API Design Guide

(cc) - HTTP API design guide extracted from work on the Heroku Platform API

Principles of good RESTful API Design

Microsoft REST API Guidelines

The Microsoft REST API Guidelines, as a design principle, encourages application developers to have resources accessible to them via a RESTful HTTP interface.

Building JSON-LD APIs: Best Practices

Zalando RESTful API and Event Scheme Guidelines

Comprehensive, opinionated guidelines for designing RESTful APIs and event schemas, widely reused by other organizations.

Principles of bot design

General Best Practices

Command Line Interface Guidelines

Deployments Best Practices

favicon-cheat-sheet

The iOS Design Guidelines

Git Style Guide

Git usage and style recommendations.

Commit messages guide

Google JSON Style Guide

Recommendations for JSON formatting and usage.

Rules of Machine Learning

(Google)

Node.js Style Guide

(cc-sa) - A guide for styling your node.js / JavaScript code. Fork & adjust to your taste

Node.js Best Practices

Summary and curation of the top-ranked content on Node.js best practices, available in multiple languages.

Security Principles

Web Security Guidelines

WebAppSec/Secure Coding Guidelines

Mozilla - A guideline containing specific secure development standards for secure web application development.

Web Application Security Guide/Checklist

A Good User Interface

"leaked ab tests"

Pagination 101

Writing style

Documentation Style Guide

Apple Style Guide

How To Ask Questions The Smart Way

Google Developer Documentation Style Guide

This style guide provides editorial guidelines for writing clear and consistent Google-related developer documentation.