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Meetup
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HackerRank - Technical Recruiting
Academy (한글)
Academy (영문)
SitePoint - Learn HTML, CSS, JavaScript, PHP, Ruby & Responsive Design
Microsoft Virtual Academy - Free Online Training for Developers, IT Professionals and Data Scientists
Code.org - Anybody can learn
Academia - Sahre research
Math is Fun - Maths Resources
edX - Free online courses from the world's best universities