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Welcome to the first of many Half-Life and Half-Life 2 related mod streams, for the first stream we're going to be looking at Build2046 which is one of the first "Complete" leak story mods with the intent of giving us another side of the Half-Life 2 universe that we never got to see. This mod is infamous for having potentially stolen content, rough mapping and gameplay, and map transitions but we're going to go in with an open mind.
Sadly the mod was pulled after including a full build of the Source engine and having stolen content so no download links are available. Your best bet to download this mod is to do some searching on the internet for a copy, I've had my copy since it came out.