MakeBizCards - Easy to use web-app for designing your own business card.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Business Card Maker - Customize Business Card templates online
draw.io - Online diagramming application
VirtuGo - Digital Business Cards - Unlimited Digital Business Cards For WordPress - Plugin
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.