The original Half-Life and Counter-Strike games were quietly released for Linux and Mac OS X last week, and as the maintainer of SteamLink, a repackaging of Half-Life: Uplink for Steam, I went out to see if the mod's files could be installed on these platforms.
Turns out there is a bug in Steam for these platforms, where it tries to launch the Windows version of Half-Life for GoldSrc mods from within Steam. However, Half-Life can be manually launched and pointed at the mod.
I have released a new version of SteamLink as a zip file. If you would like to run Half-Life: Uplink on Linux or OS X, simply download and extract the zip, and run the installer shell script. It will determine the Half-Life installation directory, install the mod, and give you a symlink to a script to launch it.