Less Wrong Product & Service Recommendations

lukeprog

I have often benefited from recommendations for Things I Didn't Know I Wanted.

Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.

Rules:

Post one product your recommend per comment, so they can be discussed and voted on independently.
Provide a link for purchasing the product.
No books, movies, TV, games, or music. (These should go in other threads, like this one or this one.)

I'll post my own recommendations to the comments section, too.

I have often benefited from recommendations for Things I Didn't Know I Wanted.

Rules:

Post one product your recommend per comment, so they can be discussed and voted on independently.
Provide a link for purchasing the product.
No books, movies, TV, games, or music. (These should go in other threads, like this one or this one.)

I'll post my own recommendations to the comments section, too.