UNIX and color computer code and compiler

swap that SE board for an SE/30's board, and you can run

• NetBSD
  
• port Mac68k
  
• The NetBSD Packages Collection (the word 'compiler' on this page no less than 60 times... looks like mostly 'C' categories... and there's Java, too)
  
• The NetBSD Guide
  

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I found some good links on Mac *NIX variations:

Alternative OS - all the possibilities!!

MkLinux

MkLinux is a project begun by the OSF Research Institute (now Silicomp RI) and Apple Computer to port Linux, a freely distributed UNIX-like operating system, to a variety of Power Macintosh platforms running on top of OSF Research Institute's implementation of the Mach microkernel.

Debian

Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux.

Debian GNU/Linux provides more than a pure OS: it comes with over 15490 packages, precompiled software bundled up in a nice format for easy installation on your machine.

How To Run Debian Linux On An SE/30

Linux/mac68k

The goal of this project is to port Linux to the 68k-based Macintoshes (not Power Macs) and to support as much hardware as possible. There are currently ports of the 2.2 and 2.4 kernels. We are working on the 2.6 kernel. Just about every Mac with a 68030 or better processor is usable in some form under Linux/mac68k, although we continue to work on improving support for some machines. Older 68000-based Macs are not supported. For more information on which machines will work, see the machine status page.

The Linux/m68k Home Pages

and last, but certainly not least... and one of my personal favs...

A/UX Server Penelope

Symantec Think C (old versions)

Apple MPW (old versions)

Codewarrior? (on an SE?!?)

A/UX Apple's old version of Unix probably requires a heftier computer.

The MPW Shell is a shell of sorts, you could conceivably compile some of the *nix utilities in this shell. bash (or some other *nix shell) running in the MPW Shell running on an Mac SE?

SE to PC - null modem cable serial port to serial port and serial file transfer programs at each end.
If the coco has RS232 serial, probably the same thing