Drop: Exchange Contacts - Seamless, cross-platform exchange. NOT another 'bizcard app'
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
MOO Business Cards+ - Beautiful NFC business cards that trigger digital actions
draw.io - Online diagramming application
Shake Business Cards - The new way to share your LinkedIn, email and phone details
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.