HyperCard

European HyperCard User Group (eHUG)
A European Apple User Group for xTalk programmers.
http://www.ehug.info

FreeCard
Official site of the opensource clone of Apple's HyperCard program. Includes development map and currently available downloads.
http://www.freecard.org/

Gary's HyperCard Page
Contains several downloadable HyperCard stacks created by the author, including a few designed for children.
http://webwonks.org/Extra/hypercard/HyperCard.html

HyperActive Software
Software development firm, specializing in Hypercard and related environments. Hypercard virus information, anti-virus software, Hypercard tutorials, and Hypercard success stories.
http://www.hyperactivesw.com

HyperActive Software/HC Virus Definitions
HyperCard Virus Compendium
http://www.hyperactivesw.com/Virus1.html

HyperCard Club's Site
A community. Includes forums and a Web ring.
http://www.geocities.com/hypercardclub/

HyperCard FAQ - Addendum
HyperCard FAQ - Addendum
http://www-psych.stanford.edu/~pinto/hc4.html

HyperCard info and freeware from Ben Lawson
HyperCard information and freeware from Ben Lawson
http://www.nobleswan.com/hypercard/

HyperCard Mailing List Archive
Searchable archive going back to February 1999. Also includes subscription instructions and other background info about the list.
http://www.quibble.com/hclist/

Pantechnicon
Database of links and information regarding all subjects of HyperCard development.
http://pan.uqam.ca/pan/pmwiki.php/HyperCard/HomePage

StackChat
A collection of articles about HyperCard programming, including many examples and links to other sites.
http://www.artgallery.nsw.gov.au/sub/jcooper/stack_chat/

A Universe In a Jar
A Newtonian physics simulator created with HyperCard for the 2003 Canada Wide Virtual Science Fair.
http://www.virtualsciencefair.org/2003/krame3r/public_html/