Rather new released Precursor mod for Half Life2 & thought it was quite enjoyable so sharing the info. Single player mod campaign is a few hours long & you don't really need to finish episode 1 or 2 to get through this (no spoilers). Enjoy.
http://www.moddb.com/mods/precursor
find it much easier to get it installed through here
http://www.precursormod.com/
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