A libre (GPL) 3do emulator for GNU/Linux, built around SDL for audio, video and input. It also includes an optional binding for OpenGL video output, that enables a nice video scaling/stretch. 3D'oh! uses FREEDO as the core emulator. It's a 3do emulation library made by Alexander Troosh, Maxim Grishin, Allen Wright, John Sammons and Felix Lazarev.
in command line run: 3doh -b biosfile -i isofile
To build from source, in command line just type 'make'. You will need the SDL libraries installed in your system. To enable OpenGL support, the -USEGL flag must be set in CFLAGS. You will need also the GL libraries.
12/01/2014:
3D'oh! it's released under the GPLv2 license.