MakeBizCards - Easy to use web-app for designing your own business card.
draw.io - Online diagramming application
ContactPass - Create Apple Wallet business card passes in seconds.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Business Card Designer - Business Card designer program allows you to design your own legit and trendy business visiting cards easily.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.