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.
libkdtree++ is a C++ template container implementation of k-dimensional space sorting, using a kd-tree. It sports a theoretically unlimited number of dimensions, and can store any data structure. Provided the data structure, it provides operator[0 - k-1] to access the individual dimensional components (arrays, std::vector already do) and a std::less implementation for the type of dimensional components. It has support for custom allocators, implements iterators, and provides standard find as well as range queries. It has amortised O(lg n) time (O(n lg n) worst case) on most operations (insert/erase/find optimised) and worst-case O(n) space, and also provides a means to rebalance and thus optimise the tree.
RoboCommish is a Perl-based Fantasy Football League(s) Management suite. Features include automatic weekly game downloads and statistic processing; independent multi-league scoring; report generation (text and HTML) and extreme customizability. The Perl implementation is intended to be OS agnostic -- both Unix/Linux and Windows distributions are available.