Building a list of the best woodworking websites. There's a ton of great websites out there. In fact there are so many that it's hard to sift through the volume to find the real jewels. I'm thinking about sites that serve as reference material, things like conversion tables, wood hardness, toxic materials, the composition of finishing products, screw types and sizes, what size hole you need to drill for what size screw, that sort of stuff. What are your go-to wood reference sites? Give us the link and if you feel moved, a couple of words about the site and why you like it [or not]. Let's start with the "techy" side of woodworking, we can expand into your fav YouTubers later.