Metaculus is a platform for generating crowd-sourced predictions about the future, especially science and technology. If you're interested in testing yourself and contributing to their project, check out their questions page
The Effective Altruism newsletter provides monthly updates on the highest-impact ways to do good and help others.
Support Slate Star Codex on Patreon. I have a day job and SSC gets free hosting, so don't feel pressured to contribute. But extra cash helps pay for contest prizes, meetup expenses, and me spending extra time blogging instead of working.
80,000 Hours researches different problems and professions to help you figure out how to do as much good as possible. Their free career guide show you how to choose a career that's fulfilling and maximises your contribution to solving the world's most pressing problems.
MealSquares is a "nutritionally complete" food that contains a balanced diet worth of nutrients in a few tasty easily measurable units. Think Soylent, except zero preparation, made with natural ingredients, and looks/tastes a lot like an ordinary scone.
Dr. Laura Baur is a psychiatrist with interests in literature review, reproductive psychiatry, and relational psychotherapy; see her website for more. Note that due to conflict of interest she doesn't treat people in the NYC rationalist social scene.
B4X is a free and open source developer tool that allows users to write apps for Android, iOS, and more.
Altruisto is a browser extension so that when you shop online, a portion of the money you pay goes to effective charities (no extra cost to you). Just install an extension and when you buy something, people in poverty will get medicines, bed nets, or financial aid.
AISafety.com hosts a Skype reading group Wednesdays at 19:45 UTC, reading new and old articles on different aspects of AI Safety. We start with a presentation of a summary of the article, and then discuss in a friendly atmosphere.
Substack is a blogging site that helps writers earn money and readers discover articles they'll like.
Giving What We Can is a charitable movement promoting giving some of your money to the developing world or other worthy causes. If you're interested in this, consider taking their Pledge as a formal and public declaration of intent.
Jane Street is a quantitative trading firm with a focus on technology and collaborative problem solving. We're always hiring talented programmers, traders, and researchers and have internships and fulltime positions in New York, London, and Hong Kong. No background in finance required.
Beeminder's an evidence-based willpower augmention tool that collects quantifiable data about your life, then helps you organize it into commitment mechanisms so you can keep resolutions. They've also got a blog about what they're doing here
Norwegian founders with an international team on a mission to offer the equivalent of a Norwegian social safety net globally available as a membership. Currently offering travel medical insurance for nomads, and global health insurance for remote teams.
The COVID-19 Forecasting Project at the University of Oxford is making advanced pandemic simulations of 150+ countries available to the public, and also offer pro-bono forecasting services to decision-makers.