Converting ARW’s on Mac OS Leopard

I’m still not sure I fully understand what LibRaw even is.

Is this something that executes in command line, or is it just a compatibility add-on for applications that already work with RAW files?

My goal is to simply convert RAW files from a Sony A7 II to something that is natively supported in Mac OS X Leopard 10.5 while still using Leopard.

I know I could do this in another OS but the point is that this is a hub for my workflow for years and I don’t want to lose Aperture support or change my tools just because I got a later camera.

Hardware is Intel x86-64

Help me get a clue hah