Algorithms and Data Structures - Definitions with links to implementations in various programming languages, by Paul E. Black.
Dictionary of Algorithms and Data Structures - Definitions of algorithms, data structures, and classical computer science problems. Some entries have links to implementations and more information.
Inverse Problems - A repository for information for researchers in inverse problems. Includes event announcements, books, and selected articles.
Journal of Modern Applied Statistical Methods - An independent print and electronic journal for applied nonparametric or parametric statisticians, data analysts, researchers, classical or modern psychometricians, quantitative or qualitative evaluators, and methodologists. Includes full text, table of contents, and editorial information for each issue.
Linkcheck.pl - A Perl script which checks the return codes of links on web pages and generates reports in either plain text or HTML.
MINOPT - A modeling language and algorithmic framework for linear, mixed-integer, nonlinear, dynamic, and mixed-integer nonlinear optimization.
OpenAD - A tool for automatic differentiation of numerical computer programs with both Fortran and C/C++ frontends. Includes downloads, documentation, mailing lists, and a wiki.
PLplot - A cross-platform open source plotting library, written in C, with bindings for many other languages such as Fortran, Java, Lisp, and Perl.