DOS programming examples:
  kelvar.zip - 2D game engine for unREAL mode DOS (by Heptagram Group).
  tetris.zip - small DOS text mode tetris (by -*[PHSW]*- Group).
  phboot.zip - FAT12 boot loader (by PetroffHeroj).

Windows programming examples:
  sclass.zip - example of superclassing Win32 controls (by Luis Alonso Murillo Murillo).
  teeth.zip - Image Organizer for Win32 (by Antoch Victor).
  online.zip - Online tester (by Serge Tserkovitsky).

Linux programming examples:
  gtk-examples.tar.gz - a pack of GTK programming examples (by Sven Blumenstein).