>includes a suite of software analysis tools for analyzing compiled code on a variety of platforms including Windows, Mac OS, and Linux

From the site, so yes it works on non-windows binaries. It also runs on Linux, Mac and Windows. This is the list of file formats I found in the docs that are supported by Ghidra

* Common Object File Format (COFF)

* Debug Symbols (DBG)

* Executable and Linking Format (ELF)

* Ghidra Data Type Archive Format

* GZF Input Format

* Intel Hex

* Mac OS X Mach-O

* Module Definition (DEF)

* Motorola Hex

* New Executable (NE)

* Old-style DOS Executable (MZ)

* Portable Executable (PE)

* Preferred Executable Format (PEF)

* Program Mapfile (MAP)

* Raw Binary

* XML Input Format