FreeBSD 11.0
You need to have a recent nvidia-driver with LINUX compatibality support or an AMD graphics card that is supported by FreeBSD. See FreeBSD Wiki for further information.
nvidia-driver or xf86-video-ati
Dependencies:
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pkg install deb2targz
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pkg install rpm2cpio
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pkg install doas
create /usr/local/etc/doas.conf :
permit nopass keepenv yourusername
download: fetch http://media.steampowered.com/client/installer/steam.deb
deb2targz steam.deb
Extract steam.tar.gz as root: tar -zxvf steam.tar.gz -C /
steam
./install.sh
./steamrun
for amd64 first run install.sh then run install_x86_64.sh also in script steamrun change variable ubuntu on ubuntu_x86_64

