If looking for an app to create, print and share greeting cards the free Greeting Box for Mac is a capable option. It has an easy to use interface with instant previews and templates that offer a good amount of personalization.
A number of templates are available for different occasions and holidays. Photos can be inserted on the cards and can be dragged and dropped, rotated, positioned and edited with clipart, text, frames, masks and other effects.
It is possible to just save the greeting cards as images, shared or printed ready for folding and save settings as projects for