Xws is a text mode multi-player crossword and chat server. It presents the same puzzle to everyone, allowing people the option to try and/or discuss solutions. Play may be friendly collaboration or fierce competition, depending on the players' dispositions. Xws supports hundreds of puzzles in the popular Across Lite file format. Copyright issues prevent the distribution from including any puzzles, but several archives and resources are listed in the README.
y-notes is a set of lightweight applets and CGI scripts which enables a webmaster to specify points where the website's visitors may leave 'sticky notes'. The notes are kept on the server so that users can retrieve them at a later time and use them as a navigation aid. y-notes are particularly useful in large sites such as tutorials and reference manuals. They can also be used in web pages as a fairly uncomplicated way of gathering user feedback which requires no registration, logins, or passwords.
Yacas is a general purpose, easy to use Computer Algebra System (a CAS is a program that can be used to do symbolic manipulation of mathematical expressions). It is built on top of its own programming language designed for this purpose, in which new algorithms can easily be implemented. In addition, it comes with extensive documentation on the functionality implemented and methods used to implement them.
Yet Another PHP Bulletin Board (YapBB) allows you to set up a forum on your Web site, using PHP4+MySQL. The goal of this project is to create a good, full featured, and free bulletin board. Features include multible boards, modular programming, different user authentication levels with appropriate privileges, a certain level of protection to prevent HTML abuse and abuse of other exploits, many client-side options, and more features to come.
ymusk stands for Yenzie's Mush Klient. It is a mush client written in Perl, and it is built around the Net::Telnet and Tk modules. It is meant to be a simple program which is easily customizable. Its features include logging, macro definition, speech filters, command history, and ANSI colors.
zlib is designed to be a free, general-purpose, legally unencumbered, lossless data-compression library for use on virtually any computer hardware and operating system. The zlib data format is itself portable across platforms. Unlike the LZW compression method used in Unix compress(1), the compression method currently used in zlib essentially never expands the data. (LZW can double or triple the file size in extreme cases.) zlib's memory footprint is also independent of the input data and can be reduced, if necessary, at some cost in compression.
ZooLib allows one to write a single set of C++ sources which can be compiled into native executables for Mac OS, Windows, BeOS, or POSIX-compliant systems that use the X Window system (such as Linux). Zoolib provides a GUI toolkit with a uniquely flexible layout system. It also provides a single-file database format, TCP networking, and extensive debugging support. ZooLib applications are multithreaded. ZooLib requires only minimal support from the underlying OS and platform GUI layer, and thus could be ported to a completely new platform without too much difficulty. ZooLib is fully production quality on Windows and MacOS, completely implemented but untested on BeOS, and not yet complete on POSIX. Please note that the sources from the "demo" branch are also required to build ZooLib or to get started writing your own ZooLib applications.