[3] This list is not complete or exhaustive, but as stated on the site:
Free and open-source software is good for you and good for the world.
This is the best free Mac software that we know of.
URL: http://www.opensourcemac.org/ [4]
and for iPhone: http://opensourceiphonesoftware.com/ [5]
Links:
[1] http://pulse.veltsos.com/category/it/software/foss
[2] http://pulse.veltsos.com/category/it/mac
[3] http://linux.philosweb.com/drupal5/files/image_2_32.png
[4] http://www.opensourcemac.org/
[5] http://opensourceiphonesoftware.com/