 If you liked
Suisei no Gargantia
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 ...then you might like
Kino no Tabi: The Beautiful World - The Animated Series
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Just to name some similiartities from the top of my head:
- Both main characters have a talking companion (Hermes, the motorcycle in Kino no Tabi and Chamber, the mech in Suisei no Gargantia).
- Both worlds have their populations live in enclosed spaces with different rules and world views (Countries in Kino no Tabi and Fleets in Suisei no Gargantia).
- While both anime have some fight scenes, the plot mainly revolves around the life-styles of the people in the countries (Kino no Tabi) / on the fleets (Suisei no Gargantia).