A free program for Android, by LINE Corporation.
LINE Card is a FREE application that allows you to send and receive real-time messages, as well as make and receive phone calls with other people around the world.
It’s very simple to use and it has many different categories of cards, from a greeting, to a message of love, to a message of happiness, to one of friendship, etc.
This application is also the official LINE application in Japan, Taiwan, Thailand, Hongkong, and Malaysia, so if you want to send a greeting to someone in that country, you can do it easily.
The user interface is really simple, so even if you have no knowledge of how to write a message, you can still use this application.