William A. SteinI write software, do mathematics, and skateboard vert.
MathematicsSageMath - open source mathematical software
Prime Numbers and the Riemann Hypothesis
The 2013 Jenks Prize for Excellence in Software Engineering applied to Computer Algebra
The Modular forms database
The L-functions, modular forms, and friends database
Software -- Sage: Creating a Viable Free Open Source Alternative to Magma, Maple, Mathematica and Matlab