aquaria: Only "source code" is free, art assets are proprietary[1].
gish: Is available as freegish in Debian[2].
lugaru: Pending in the NEW queue[3].
penumbra: Only "source code" is free, art assets are proprietary[4].
[1] http://hg.icculus.org/icculus/aquaria/file/bfa7c24822c0/README.txt
[2] http://packages.debian.org/source/sid/freegish
[3] http://ftp-master.debian.org/new/lugaru_0~20110520.1+hge4354+dfsg-1.html
& http://ftp-master.debian.org/new/lugaru-data_0~20110520.1+hge4354-1.html
[4]
http://frictionalgames.blogspot.com/2010/05/penumbra-overture-goes-open-source.html
--
arand
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