Half-Life: Sum takes place during and after the resonance cascade in which you play as the tough as nails HECU grunt Jane Doe as she has to wade through 11 sprawling maps. A compilation of the previous released mods "HTC", "Autonomy Lost" and "Abeyance".
These are all the map source files for Half-Life: Sum. Please note that they're in the JMF file format which requires the J.A.C.K. editor in order for them to work. Read the readme.txt for more info.
oh, awesome