Original source code seems to be lost. Though there's some evidence suggesting Goonstation is the original, mainly archive.org copies of the website linked in Byond's gamelistings for the main game.
The various servers have custom splash art that name the server in some similar fashion to Space Station 13 but there's usually no server that runs by the original name. Since the server names are player host provided, such are also unusable as alternate titles for this game even if they pop up in screenshots and similar.
About Space Station 13
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