One-Liner displays a small amount of text that takes up the entire screen. That's all it does. You can't change the font or the colors (yet). Just launch the app, tap on the screen to edit, and then hold up your message for the world to see.
I wrote this for my own use because sometimes I need to display short messages, either to spell my name for people or to show them some other bit of information. Since I haven't seen another app designed for this purpose, I'm uploading this for free. Enjoy.