I just released an artifact to Maven that contains the Firebird native
client (32 bit and 64 bit) for Windows and Linux.

Combined with Jaybird 3 or higher and JNA, this can be used to connect
using the native and local sub-protocols without having the Firebird
client on the library path.

Be aware, this solution does not work for the embedded protocol of
Jaybird. I plan to provide a similar artifact for embedded in the
future, but that is a bit more complicated to do.

See https://github.com/mrotteveel/jaybird-fbclient for details.
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Mark Rotteveel