Universitext (Springer)
Dover Mathematics
Houston Journal of Mathematics
Journal of Lie Theory
Journal of Mathematical Analysis and Applications
Mathematica Slovaca
Mathematics Teacher
Positivity
Studia Mathematica
University of Connecticut
University of Missouri (Kalton Memorial Website)
Seattle University
MathSciNet
MSC 2010
HTML Color Codes
The ArXiv
WolframAlpha
Tyler Vigen's interesting webpage of Spurious Correlations
Rate My Professors Dot Com (my UCSD profile)
My Google Sites Page (no longer updated)
xkcd
Saturday Morning Breakfast Cereal