Like Analog, Flare (see TUAW review here) provides a way to add and adjust pre-loaded visual effects. Flare comes with quite a few more effects than Analog -- a total of 31 -- and allows quite a bit more in terms of control and the addition of effects.
What's new in Flare 1.4? There's now support for Retina displays, there's new high-resolution editing and the user interface has changed. Like many apps updated for OS X Mountain Lion, Flare 1.4 adds a significant number of sharing services including "upload to Twitter." There's a new "Save to Aperture" feature as well. As we noted with the Analog update yesterday, the app supports the external editor mode in Aperture and iPhoto, and adds Lightroom as well.
Several bug fixes have also been incorporated. For existing users, it's available immediately from the Updates tab of the Mac App Store.