3 links
Computations in Algebraic Geometry with Macaulay 2
math.uiuc.edu
Edited by David Eisenbud, Daniel R. Grayson, Michael E. Stillman, and Bernd Sturmfels. Full text in DVI, PS and PDF.
Ideals, Varieties, and Algorithms
cs.amherst.edu
By David A. Cox, John B. Little and Don O'Shea. Errata, solutions, Maple and Mathematica software.
Mirror Symmetry and Algebraic Geometry
cs.amherst.edu
By David A. Cox and Sheldon Katz (American Mathematical Society, 1999). Errata.