free software invitation cards?

Answer 1

If you've Microsoft office:
http://office.microsoft.com/en-us/templates/results.aspx?qu=invitation+card

If you've OpenOffice:
http://documentation.openoffice.org/Samples_Templates/User/template_2_x/draw/index.html

If you've Illustrator or Word:
http://www.thepapermillstore.com/pages.php?pageid=176
http://www.thepapermillstore.com/pages.php?pageid=187

Also check out:
http://www.surfpack.com/software/invitationcarddesigner/