Manually curated collection of resources for frontend web developers
https://github.com/dypsilon/frontend-dev-bookmarks

A series of books diving deep into the core mechanisms of the JavaScript language
https://github.com/getify/You-Dont-Know-JS

A long list of (advanced) JavaScript questions, and their explanations
https://github.com/lydiahallie/javanoscript-questions

Algorithms and data structures implemented in JavaScript with explanations and links to further readings
https://github.com/trekhleb/javanoscript-algorithms

The Node.js best practices list
https://github.com/goldbergyoni/nodebestpractices

A collection of tips to help take your CSS skills pro
https://github.com/AllThingsSmitty/css-protips

People choose popular projects, often not because it applies to their problems
https://github.com/you-dont-need/You-Dont-Need

Real world implementations
https://github.com/gothinkster/realworld

A collective list of free APIs
https://github.com/public-apis/public-apis

Short JavaScript code snippets for all your development needs
https://github.com/30-seconds/30-seconds-of-code

#webdev

Awesome cheatsheets for popular programming languages, frameworks and development tools
https://github.com/LeCoupa/awesome-cheatsheets

A curated list of software and architecture related design patterns
https://github.com/DovAmir/awesome-design-patterns

Awesome online talks and screencasts
https://github.com/JanVanRyswyck/awesome-talks

Master programming by recreating your favorite technologies from scratch
https://github.com/codecrafters-io/build-your-own-x

#general