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The career-research org built around one question — how do you use your working life (the eighty thousand hours of it) to actually make the world better? Free career guide, free coaching for serious candidates, in-depth research into which problems and which jobs have the highest marginal impact. The Effective Altruism community's most readable, least scoldy front door.

Anthropic's free, ad-free, working-engineer-grade course on building with Claude. Prompt engineering, agentic patterns, Claude Code, the Agent SDK, the MCP protocol — taught by the people who actually build the platform, in the depth that hands-on technical work requires. Free in the sense that matters: no upsell, no email-capture wall, no advertising. The fastest way to go from 'I have used ChatGPT' to 'I can ship with Claude.'

Interactive math, science, and computer science — every lesson designed as a hands-on problem set rather than a video to watch. Subscription-priced, ad-free, no behavioural tracking. The platform that does for STEM what Duolingo does for languages: small daily reps that compound into real fluency.

Sal Khan's non-profit education platform. Free, ad-free, comprehensive — kindergarten math through college calculus, US history, economics, physics, biology, computer science, art history. Funded by donations and grants rather than ads or data sale. The closest thing the internet has produced to genuinely accessible, ad-free, quality general education.