I was having a problem with Eclipse Kepler (4.3) giving the following message on my Mac OS X 10.8 with Java 7:

“Eclipse” is damaged and can’t be opened. You should move it to the Trash.

WTF?!? But, thanks to this blog post by Down Home Country Coding, the problem is easily solved by running the following command in Terminal.app:

xattr -d com.apple.quarantine /Applications/eclipse/Eclipse.app

Thanks for being awesome, Down Home Country Coding!