Vue

• bbatsov
• GitHub - Based on bbatsov style guide.

Ruby on Rails

• bbastov's Ruby on Rails 4 styleguide

• CSSWizardry - This is the best there is. Made by one guy who consults for a lot of companies, this document pretty much sets the standards for how CSS should be used. Highly suggested.
• GitHub
• Smashing Magazine
• Trello
• Wordpress.org
• CSS Best Practices
• Idiomatic-CSS
• rscss - Reasonable Standard for CSS Stylesheet Structure.

Sass

• CSS-Tricks
• Sass Guidelines

React

• John Cobb
• Khan

Sass

• feross/standard
• Google
• hapi
• Joyent
• Khan
• Mozilla/pdf.js
• Airbnb
• bevacqua's JS sg
• jscs
• rsjs - Reasonable Standard for JavaScript Structure.

AngularJS

• Google
• jmcunningham's fork
• gocardless
• johnpapa's opinionated sg for AngularJS
• mgechev's community best practices
• srph's AngularJS structure sg
• Todd Motto's for AngularJS

JSON

• Google

Vue

• Vue Style Guide - The official style guide for Vue-specific code.

CoffeeScript

• Polarmobile

HTTP Design

• http-api-design
• http-api-guide - Chinese.

jQuery

• Pragmatic jQuery

Modules

• mattdesl

npm

• npm Style Guide - An opinionated collection of best practices for teams by [@deVoorhoede](https://twitter.com/devoorhoede).

Riot

• RiotJS Style Guide - Opinionated RiotJS Style Guide for teams by [@deVoorhoede](https://twitter.com/devoorhoede).

Sass

• Google

Sass

• Google

Sass

• agis-
• Udacity - Git Commit Message Style Guide from Udacity.

Sass

• Android
• Google
• Sun

Vue

• Dropbox Objective-C Style Guide
• Futurice iOS Good Practices - iOS starting guide and good practices suggestions by [@futurice](https://github.com/futurice).
• GitHub Objective-C Style Guide - Style guide & coding conventions for Objective-C projects.
• NY Times - Objective C Style Guide - The Objective-C Style Guide used by The New York Times.
• Objective-C Coding Convention and Best Practices - Gist with coding conventions.
• raywenderlich Style Guide - A style guide that outlines the coding conventions for raywenderlich.com.
• Spotify Objective-C Coding Style - Guidelines for iOS development in use at Spotify.
• Khan
• GitHub - Style guide & coding conventions for Swift projects

Vue

• PSR-1: Basic Coding Standard
• PSR-2: Coding Style Guide

Vue

• Google
• PEP 8 Offical Style Guide for Python
• PEP 257 - Docstring Conventions
• The Hitchhiker's Guide to Python

Ruby on Rails

• aturon

Ruby on Rails

• BBC News Style Guide - The guide for all BBC News output covers spelling, punctuation and grammar, as well as accuracy, fairness and impartiality.
• Bishop Fox Cybersecurity Style Guide - From malicious viruses to viral memes, for security researchers.
• BuzzFeed Style Guide - An evolving set of standards for the internet and social media.
• Guardian and Observer Style Guide - The guide to writing, editing and English usage followed by journalists.
• Wikipedia Manual of Style - The style manual for all Wikipedia articles.
• raywenderlich

Ruby on Rails

• Xerox Publishing Standards - The definitive reference to writing style and design for the business world. Provided courtesy of Xerox Corporation.
• ![CC0
• Richard Littauer
• ![CC0

Sass

• THX - Added because this is the first Chinese styleguide I have seen that has any significant amount of stars.
• Google

Vue

• emacs-lips-style-guide