- Khan Academy: Free online education, in a very easy-to-digest format.
- PubMed: A website which aggregates a lot of different medical publications.
- AptlyU: My girlfriend's Web Design and Development company.
- Prismata: Prismata is an online card game, which plays a lot like chess combined with starcraft build orders.
- Chess.com: A great place to play chess online.
- Zachtronics: Zachtronics is an awesome company which makes great puzzle games. I especially like spacechem and TIS-100.
- Zachtronics Old Site: Before zachtronics was a real company, it was one guy who made puzzle games in his spare time. Worth noting are:
Ruckingenur, Ruckingenur II, KOHCTPYKTOP (constructor, in Russian), Manufactoid, Infiniminer,
The Codex of Alchemical Engineering, Alchemical Engineering: Magnum Opus Challenge.
- Candy Box 2: An awesome, challenging game. If I told you anything about it, I'd be spoiling it. Good luck!