Economy and investments

• FIRE: Financial Indipendence and Early Retirement
• MMM: Mr. Money Mustache

Computer science

• Stanford Engineering Everywhere
• MIT OpenCourseWare
• Coding Interview University
• Open Source Society University
• Awesome CS Courses
• Everything Computer Science
• Papers we love
• From @rcastellotti:
  • The Missing Semester of Your CS Education

Programming

• FreeCodeCamp:
  • Website
  • Youtube
  • Github
• Free Programming Books
• Awesome cheatsheets
• Codecademy

Webdev

• From @rcastellotti:
  • A collection of free single-purpose online tools for web developers