So far 2019 is pretty meager with Linux and Mac additions, so let's take a look at some potential future entries to this list, as per GamingOnLinux:
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X4: Foundations could be arriving along with the v2.5 update, due in early 2019.
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Steel Rats should be adding macOS and Linux builds this Wednesday. At least on Steam...
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Wargroove is still "Coming Soon" here on GOG even though it was released on Steam back on 1 February. It's since added
a non-officially-supported macOS build and Linux is being looked into as well.
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Ashes of the Singularity: Escalation seems to be working natively on Linux, but its performance is not that good yet.
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The Bard's Tale IV: Barrows Deep should become multi-OS come next June, in time for the
Director's Cut update.