CodeSourcery, LLC
   CodeSourcery, LLC: CodeSourcery, LLC. Development tools, especially for C and C++. The premiere provider of support, enhancement, and extension services for the GNU Compiler Collection (gcc) and the GNU development toolchain (binutils, gdb).
   http://www.codesourcery.com/

Hsoi's Shop
   source code: Hsoi's App Shell, WASTE Object Handlers; PowerPlant Classes: CURLPushButton, CVersCaption, HCmdButtonAttachment, HMarqueeCaption, HSharableResource, HSharablePicture, HStringList, HToggleRadioButton
   http://www.hsoi.com/hsoishop/

Ingemar's Corner
   Archive of source-code, all commented, mostly in Pascal. Also home of SAT (Sprite Animation Toolkit).
   http://pascal-central.com/ingemars-corner.html

SourceForge
   Source code repository
   http://sourceforge.net/

iDevGames.com
   Features source code for Mac games and encourages submissions.
   http://www.idevgames.com/