Install the shareware version

Packages describing “demo” as local USE flag

Package “demo” Flag Description
games-fps/rott Install the shareware version
games-fps/duke3d-data Extract data files from the shareware version.
games-fps/quake2-icculus Install the demo files (quake2-demodata) and configure for use
games-fps/qudos Install the demo files (quake2-demodata) and configure for use
games-arcade/jazz2-data Use the free demo data instead of the full retail game data
games-fps/darkplaces Uses the demo data from quake1 (quake1-demodata)
games-fps/doomsday Install launcher dor doom1.wad from games-fps/doom-data
net-analyzer/netperf Emit interim results during the run. May affect results

All packages providing a “demo” USE flag (7)