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PDL (``Perl Data Language'') gives standard perl the ability to COMPACTLY store and SPEEDILY manipulate the large N-dimensional data arrays which are the bread and butter of scientific computing. The idea is to turn perl in to a free, array-oriented, numerical language in the same sense as commerical packages like IDL and MatLab. One can write simple perl expressions to manipulate entire numerical arrays all at once. For example, using PDL the perl variable $a can hold a 1024x1024 floating point image, it only takes 4Mb of memory to store it and expressions like $a=sqrt($a)+2 would manipulate the whole image in a few seconds. A simple interactive shell (perldl) is provided for command line use together with a module (PDL) for use in perl scripts.

Gri is a language for scientific graphics applications. By 'language' I mean that it is a command-driven application, as opposed to a click/point application. It is analogous to latex or tex, and shares the property that extensive power is the reward for tolerating a modest learning curve. Gri output is in industry-standard PostScript, suitable for incorporation in documents prepared by various text processors. Gri can make x-y graphs, contour-graphs, and image graphs. In addition to high-level capabilities, it has enough low-level capabilities to allow users to achieve a high degree of customization. Precise control is extended to all aspects of drawing, including line-widths, colors, and fonts. Text includes a subset of the tex language, so that it is easy to incorporate Greek letters and mathematical symbols in labels.

Ipopt (Interior Point OPTimizer, pronounced eye-pea-Opt) is a software package for large-scale nonlinear optimization. Ipopt is written in C++ and is released as open source code under the Eclipse Public License (EPL). It is available from the COIN-OR initiative. The code has been written by Carl Laird and Andreas Wchter, who is the COIN project leader for Ipopt. The Ipopt distribution can be used to generate a library that can be linked to one's own C++, C, or Fortran code, as well as a solver executable for the AMPL modeling environment. The package includes interfaces to CUTEr optimization testing environment, as well as the MATLAB and R programming environments. IPOPT can be used on Linux/UNIX, Mac OS X and Windows platforms. An excellent reference for this library can be found in: Wachter and L. T. Biegler, On the Implementation of a Primal-Dual Interior Point Filter Line Search Algorithm for Large-Scale Nonlinear Programming, Mathematical Programming 106(1), pp. 25-57, 2006

PLplot is a library of C functions that are useful for making scientific plots from a program written in C, C++, or Fortran. The PLplot library can be used to create standard x-y plots, semilog plots, log-log plots, contour plots, 3D plots, mesh plots, bar charts and pie charts. Multiple graphs (of the same or different sizes) may be placed on a single page with multiple lines in each graph. Different line styles, widths and colors are supported. A virtually infinite number of distinct area fill patterns may be used. There are almost 1000 characters in the extended character set. This includes four different fonts, the Greek alphabet and a host of mathematical, musical, and other symbols. The fonts can be scaled to any desired size. A variety of output devices are supported and new devices can be easily added by writing a small number of device dependent routines.

"xtail" watches the growth of files. It's like running a "tail -f" on a bunch of files at once. You can specify both filenames and directories on the command line. If you specify a directory, it watches all the files in that directory. It will notice when new files are created (and start watching them) or when old files are deleted (and stop watching them). This program is an oldie but goodie. It was posted to comp.sources.misc in July 1989 (see ftp.uu.net:/usenet/comp.sources.misc/volume7/xtail.Z). I remember posting an even earlier version to alt.sources. It has been published in the O'Reilly & Associates "Unix Power Tools" collection (book and CD-ROM). Over the years, some fly-by-night organizations (such as the MIT X Consortium and SGI) have tried to steal the "xtail" name. Don't be fooled! Insist on the original.

check_multi is kind of a wrapper plugin which takes benefit of the Nagios 3.x capability to display multiple lines of plugin output. It calls multiple child plugins and displays their output in the long_plugin_output. A summary is given in the standard plugin output. The child return code with the highest severity becomes the parent (check_multi) plugin return code. The configuration is very simple: a NRPE-stylish config file contains a tag for each child plugin and then the check command line. check_multi can cover complex Business Process Views - using a builtin state evaluation mechanism. The second benefit is cluster monitoring with no need for extra services. All you need is provided by check_multi. LICENSE: GPL2 or later

This code forms a set of C++ libraries for multimedia streaming, using open standard protocols (RTP/RTCP and RTSP). These libraries - which can be compiled for Unix (including Linux and Mac OS X), Windows, and QNX(and other POSIX-compliant systems) - can be used to build streaming applications. The libraries are already being used to implement applications such as "liveCaster" and "playRTPMPEG" (for streaming MP3 audio using RTP/RTCP). The libraries can also be used to stream, receive, and process MPEG video, and can easily be extended to support additional (audio and/or video) codecs. They can also be used to build basic RTSP clients and servers, and have been used to add streaming support to existing media player applications, such as "mplayer".

This module provides a WebDAV server. WebDAV stands for "Web-based Distributed Authoring and Versioning". It is a set of extensions to the HTTP protocol which allows users to collaboratively edit and manage files on remote web servers. Net::DAV::Server provides a WebDAV server and exports a filesystem for you using the Filesys::Virtual suite of modules. If you simply want to export a local filesystem, use Filesys::Virtual::Plain as above. This module doesn't currently provide a full WebDAV implementation. However, I am working through the WebDAV server protocol compliance test suite (litmus, see http://www.webdav.org/neon/litmus/) and will provide more compliance in future. The important thing is that it supports cadaver and the Mac OS X Finder as clients.

former QueSO home page <URL:http://www.apostols.org/projectz/queso/>: How we can determine the remote OS using simple TCP packets? Well, it's easy, they're packets that don't make any sense, so the RFCs don't clearly state what to answer in these kind of situations. Facing this ambiguous, each TCP/IP stack takes a different approach to the problem, and this way, we get a different response. In some cases (like Linux, to name one) some programming mistakes make the OS detectable. QueSO sends: 0 SYN * THIS IS VALID, used to verify LISTEN 1 SYN+ACK 2 FIN 3 FIN+ACK 4 SYN+FIN 5 PSH 6 SYN+XXX+YYY * XXX & YYY are unused TCP flags All packets have a random seq_num and a 0x0 ack_num.

ubh - the Usenet Binary Harvester - is a GPL'ed Perl console application which automatically discovers, downloads, and decodes single-part and multi-part Usenet binaries. Automatically assembles multi-part binaries. Provides searching via Perl regular expression syntax. Also provides a pre-selection capability whereby the user can interactively choose which binaries to download. Uses a standard .newsrc file to control which groups and articles to process. Runs anywhere Perl runs. Tested under Unix-based Perl, Active Perl on Win32 platforms, and Mac OS X. Requires Net::NNTP and News::Newsrc (which itself requires Set::IntSpan), MIME::Parser, MIME::Base64, IO::Stringy, and MailTools (distribution). [ This port is maintained by John Holland <john@zoner.org> ]