This page provides links to a variety of freeware written by Jan Wolter. Party is heavily used on both M-Net and Grex, and has been installed on dozens of other systems. It is quite robust and portable. Write is a freeware re-implementation of the unix write program with many excellent new features. Write has been heavily used on M-Net and Grex for at least eight or nine years now, and is quite solid.
Some older systems are trickier.
This is the one and only original cursive program. Cchess is a correspondence chess game. Many fairie chess variations are also supported. Robots is a screen-based implementation of the classic robot game.