FFTW is a fast C FFT library. It includes complex, real, symmetric, multidimensional, and parallel transforms, and can handle arbitrary array sizes efficiently.It is typically faster than other freely available FFT implementations, and is even competitive with vendor-tuned libraries (benchmarks are available at the homepage). To achieve this performance, it uses novel code generation and runtime self optimization techniques (along with many other tricks).
GeneWeb is a system for people who want to publish their genealogy data on the Web. It can also be used locally (not connected on the net) as a normal genealogy program. It uses very efficient techniques of relationship and consanguinity computing, speaks several languages, and can run in conjunction with an existing Web server (CGI) or standalone using its own internal server.
SwiftSurf is an HTTP proxy that lets you do a lot of things. You can spy, filter, and modify the HTTP requests that your browser sends, as well as the answers it receives. Some of its possible uses include filtering ads, limiting access to a specific domain, or suppressing cookies.
Unison is a file-synchronization tool for Unix and Windows. It allows two copies of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other. Unison can deal with updates to both replicas of a distributed directory structure. Updates that do not conflict are propagated automatically. Conflicting updates are detected and displayed. Unison can communicate through a direct socket link or through an rsh/ssh tunnel. It uses network bandwidth efficiently.
SMLserver is a Web server plugin for AOLserver, an Open Source multi-threaded Web server provided by America Online and used for large-scale, dynamic Web sites. SMLserver allows efficient threaded execution of Standard ML programs and inherits many of the great features of AOLserver, including the possibility of accessing a variety of different relational database management systems (RDBMSs), such as Oracle, MySQL, and PostgreSQL.
WDialog is a system to make dialog-centric Web applications. It imitates the behavior of widgets found in GUIs, but acts in an HTML/HTTP environment. It uses its own XML-based UI language, but callbacks are coded in a normal programming language: either O'Caml or Perl. WDialog is written in Objective Caml, an ML variant.
Bibgrep indexes and efficiently searches BibTex files. Its usage is similar to the command grep and the queries use a Google-like syntax. Bibgrep will create an index for each BibTex file it touches, and keep the result within "~/.bibgrep.idx" (by defaults). It watches the modification date and the size of the original BibTex file, and will update (and delete) its index as needed.