I've written a few books and am trying to crowdfund my next one.
I write about the things I code on my blog.
Q&A for professional and enthusiast programmers
Q&A for people studying math at any level and professionals in related fields
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for professional, enthusiast and amateur photographers
Q&A for apps, scripts, and development with the Stack Exchange API
Q&A for professional graphic designers and non-designers trying to do their own graphic design