Packages with the demo use flag

dev-libs / granite : Elementary OS library that extends GTK+

Build the Granite demo application (to present all available UI features provided by the library)

games-action / d1x-rebirth : Descent Rebirth - enhanced Descent 1 engine

Use the demo data instead of the full game

games-fps / darkplaces : Enhanced engine for iD Software's Quake 1

Uses the demo data from quake1 (quake1-demodata)

games-fps / doomsday : A modern gaming engine for Doom, Heretic, and Hexen

Install launcher dor doom1.wad from games-fps/doom-data

games-fps / eduke32 : An open source engine port of the classic PC first person shooter Duke Nukem 3D

Install the Duke Nukem 3D demo files, provided by games-fps/duke3d-demodata.

games-fps / quake2-icculus : The icculus.org Linux port of iD's Quake 2 engine

Install the demo files (quake2-demodata) and configure for use

games-fps / qudos : Enhanced Quake 2 engine

Install the demo files (quake2-demodata) and configure for use

games-fps / rott : Rise of the Triad for Linux!

Install the shareware version

net-analyzer / netperf : Network performance benchmark

Emit interim results during the run. May affect results