Don't Make Me Think - Originally written in 2000, Don't Make Me Think is one of the original books on web design and usability. Although it's been around for a while, the goals and lessons of the book are universal and apply to websites today.
VisualSitemaps - Autogenerate visual sitemaps in seconds.
The Design of Everyday Things - A timeless book, The Design of Everyday Things explores the fundamentalprinciples behind all design, and how to understand the psychology behind how we use things, and why they frustrate us.
Codrops Blueprints - Free website concepts ready to implement or modify
Coursera - "Compilers" by Stanford - The course explores how high-level languages are compiled to low-level assembly.
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.