 If you liked
Cowboy Bebop
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 ...then you might like
Space Pirate Captain Herlock: Outside Legend - The Endless Odyssey
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Both are Space Operas and dip into the Space Western genres. They lack many similarities in plot and characters (except for a rather uncanny similarity between Harlock and Vicious, appearance-wise, right down to the creepy bird) but through genre alone they are quite related and both have themes of 'space'='freedom'. Harlock is also one of the forerunners of Space Opera anime in general, so any fan of Bebop should see where the influences came from, and any fan of Harlock couldn't do wrong with what's been called one of the best anime ever made EVER.
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Recommended by noirgrimoir