ics.el is a comint based Emacs major mode for handling the text portion of communications with internet chess servers such as FICS and ICC. It is written in Emacs-Lisp and works best in conjunction with a graphical interface such as Xboard. It handles colour highlighting and "buttonisation" (making certain portions of text active so that, for example, you can challenge opponents with a single mouse click) as well as command recall and editing and automation of commands based on regexps seen in the ICS output, all highly customisable using Emacs lisp.
Overflow is a board game for two players or one player against the computer. Put pieces on the board until critical mass is reached, and watch a chain reaction go off. Although the rules are simple, several different tactical considerations are required in order to play the game well.