Quick OpenBSD facts

Default shell: Korn shell (ksh) for root; Bourne shell (sh) for users; the C shell (csh) is also included by default.
Default editor: vi
File system: BSD Fast File System (FFS) with soft updates (no journalling necessary)
Kernel: 4.4BSD-based, monolithic, SMP-capable, does not support external kernel modules by default
Binary support: OpenBSD, FreeBSD, SCO/ISC, SVR4, Linux, BSD/OS
Supported architectures: Alpha, AMD64/EM64T, cats, hp300, hppa, i386, luna88k, mac68k, macppc, mvme68k, mvme88k, sgi, sparc, sparc64, vax, zaurus
Hardware support (i386)