ZDoom : An enhanced port of the official DOOM source

ZDoom is an enhanced port of the official DOOM source. It features support for all Hexen editing features (including ACS, hubs, etc.), support for most BOOM editing features, freelook, jumping, and translucency support, a Quake-style console, high screen resolutions, removal of the original DOOM's limits, support for many more music formats (including MOD, IT, XM, S3M, MIDI, MP3, and MUS), better mouse support, UDP networking, and more.

[Environment] Win32 (MS Windows), X11 Applications
[Intended Audience] End Users/Desktop
[License] Freely Distributable
[Operating System] Microsoft :: Windows :: Windows 95/98/ME, Microsoft :: Windows :: Windows NT/2000/XP, POSIX :: Linux
[Programming Language] Assembly, C, C++
[Topic] Games/Entertainment :: First Person Shooters

Empire : A game that is played against human opponents over a computer network

Empire is a game that is played against human opponents over a computer network. It is possible for a game to last from a few hours to many months. While the common goal of an Empire player is to win, there is no clear-cut definition of what winning is. Players may seek to achieve whatever goals they want to achieve.

[Environment] Console (Text Based), No Input/Output (Daemon)
[Intended Audience] End Users/Desktop
[License] OSI Approved :: GNU General Public License (GPL)
[Operating System] MacOS X, Microsoft :: Windows :: Windows NT/2000/XP, Unix
[Programming Language] C
[Topic] Games/Entertainment :: Real Time Strategy, Games/Entertainment :: Turn Based Strategy