I also recommend the Cocoa docs at developer.apple.com.

I am learning GNUstep. There may be additional GNUstep programs in the future.

This site hosts the following pages (screenshots and TGZ / ZIP downloads):

• GFractal, computes several different fractals including the Mandelbrot set
• GMines, the well-known minesweeper game
• Yap, formerly GPSText, a GNUstep PostScript, PDF and text previewer, which can also preview LaTeX, JPG, PNG, and TIFF images, and format source code in diverse languages like C, BASH, Lisp or Objective C
• GMastermind, the classic mastermind game
• Jigsaw, simulates a jigsaw puzzle
• Sudoku, Sudoku generator
• Ticker, a GNUstep RSS monitor.
• fexclient, a GNUstep F*EX client (large file spooler)
• GScheme, a GNUstep toy Scheme interpreter.

  ---

  

  The GNUstep cookbook is here: cookbook.tgz or cookbook.zip.

  The TGZ and ZIP archives include the complete source code of all recipes.

  Recipes include:

  • using distributed objects to play "Connect Four" over the network
  • n-queens problem (place n nonattacking queens on an n x n board)
  • permuting an array
  • reading data from a task
  • processing mouse clicks
  • steganography
  • enumerating nonisomorphic graphs with Polya's theorem and GMP
  • parsing POST and GET variables in CGI scripts
  • parsing HTTP cookies
  • webchat with MySQL
  • screengrab with X11, uses XGetImage and XQueryTree

  Debian packages (etch, amd64) for some of the above programs may be found here. Open with e.g. openapp GMines.app/GMastermind2.app/Jigsaw.app.

  ---

  For general enquiries regarding the whole site, please contact the author, whose homepage is here.