The nquake package makes
it easy for users to set up a new installation of Quake that is ready to connect
to any QuakeWorld server.
This installs Quake 1 shareware and ezQuake as part of its setup process.
The setup says it requires Pak1.pak from the registered version of Quake,
but this can be ignored if you only wish to play multiplayer QW games.
Download from nquake.sourceforge.net.
The original Quake 1 shareware is available from download.com.