Planetary system view

ironseed

science-fiction exploration/strategy adventure game in space

It was originally both developed and published by Channel 7 for DOS in 1994. Gameplay is real-time, featuring trading, diplomacy, and strategy, and somewhat resembles Star Control 2 / Ur-Quan masters.
ncurses-based klondike solitaire game

tty-solitaire

ncurses-based klondike solitaire game

Play solitaire in your favorite terminal, screen/tmux or even in a remote SSH session.
complete Go board

cgoban

complete Go board

CGoban (Complete Goban) is a computerized board on which you can play the game of Go against another player, view and edit smart-go files, and connect to Go servers on the internet. It can also interface with computer Go programs such as GNU Go that speak the Go modem protocol. Some sort of image converter is needed if you wish to use the utility provided to capture "screen shots" of a CGoban game.
chocolate-doom running freedoom WADs

chocolate-doom

Doom engines closely-compatible with Vanilla Doom

Chocolate Doom aims to accurately reproduce the original DOS version of Doom and other games based on the Doom engine in a form that can be run on modern computers. Unlike most modern Doom engines, Chocolate Doom is not derived from the Boom source port and does not inherit its features (or bugs).
Fast-paced 3D first-person shooter

nexuiz

Fast-paced 3D first-person shooter

Nexuiz Classic is a fast-paced 3D deathmatch game with high-end and complex graphics effects. It is intended to be played over the Internet or over a local network. Several different game types, such as classic deathmatch, team deathmatch and capture the flag are available. It also supports a single-player mode and playing against the computer.
interpreter of Z-code story-files

frotz

interpreter of Z-code story-files

Frotz interprets Z-code story-files, which are usually text adventure games (although a few arcade-style Z-code games have been written). Examples of such story files include the adventure games published by Infocom, as well as any games produced by compilers to this format, such as Inform. You can find a number of Inform-compiled games up for anonymous FTP at ftp://ftp.ifarchive.org/ or HTTP at http://www.ifarchive.org/