Frameworks
CPLAT, Macintosh Application Development Essentials (MADE, MacZoop - the free C++ application framework for M, Whisper
OpenGL
"mac-opengl" Mailing List (Apple), Calum Robinson's OpenGL demo, Jack's Macintosh Software, Must-See 3-D Engines - BYTE Magazine, June 1996, OpenGL on the Macintosh (Apple Developer), Quesa
FAXstf Developer's Kit
A series of libraries and API's that allows developers to integrate fax reception, creation and transmission into applications.
GameCode
Cross platform multimedia library and toolbox for Windows and Mac OS.
Internet Config
home page for the standard internet configuration API
Macintosh source archive
maintained by Matthias Neeracher
PIconServices
PIconServices gives you ref-counted icons all the way back to System 7.5.3.
Piddle Backend
Cross-platform cross-format 2-D graphics library for Python.
Programming Utilities
Including Comment Inserter, Rsrc<->Data, Insert String, MultiBit, Sprite Functions, Scrolling Text Credits, Pascal String Functions for C
Sailmaker Software Limited
Provides various code libraries, including PPP control, PowerPlant classes, and an Excel plug-in framework.
UUIDLib
addresses the problem of generating Universally Unique Identifiers, identifiers which are guaranteed to be unique across all platforms throughout the world