Resources from Apple:

Macintosh IIfx HardWare docs
Macintosh SE/30 Hardware Docs
Macintosh Memory Configurations
Alot Of Links to QuickDraw Docs
OpenFirmware Docs
Networking Docs

Resources from ARDI

Executor Internals: How to Efficiently Run Mac Programs on PCs

General Development Tools

UI Archive winsite/win95 (Windows95 Dev. Tools)

Freeware C++ Compilers (By Platform)

Multiple\Independant
GNU superoptimizer
Lcc (vax, mips, sparc, 68k)
Windows95
GNUPro by Cygnus Solutions
DOS
DJGPP
UNIX
GNU CC (gcc)
GNU C Library (glibc)
Ups (X11 debug tool)
AE (application executive)

MacOS
GNU CC (unsupported)
Harvest C
OS/2
EMX Programming environment for OS/2