an open Source visualization software with several graph layout programs.
VTK (The Visualization Toolkit)
an open source visualization program for 3D computer graphics and imaging.
an open source interactive graph visualization platform that runs on Windows, Linux and Mac OS—accepted again by Google Summer of Code 2011.
CiteSeer is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. CiteSeerx aims to improve the dissemination of scientific literature and to provide improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness in the access of scientific and scholarly knowledge. CiteSeerx has developed new methods and algorithms to index PostScript and PDF research articles on the web.
arXiv.org provides open access to 668,955 e-preprints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.
Numerical Recipes Online provides online access to Numerical Recipes books in C++, Fortran 77 and Fortran 90, and more. These titles are publicly available, although some have printing limits.