I dont own any of these sites, but hopefully their owners will step up for the link exchange or banner exchange. they are all cool sites.
Kuat Drive Yards:
http://se4kdy.cyberwars.com/
Universal ShipYards:
http://universalshipyards.tripod.com/
Rambie's SE4 ShipYards:
http://www.xmission.com/~rstulce/SE4-Index.htm
Hyperion Base was scuttled. there are several more that are deserving of mention, but you can easily pull them from the link sections of these other pages. Captain Spoogey has a page, but if i recall correctly he was putting in plugs for it 5 times a day when he first showed up here, so i will leave him the satisfaction of posting the link himself.
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"...the green, sticky spawn of the stars"
(with apologies to H.P.L.)