I'm using Ubuntu 13.10 Saucy Salamander 64bit and Eclipse Kepler 64bit terminates after some random time without response. The windows simply disappears.
There's also no entry about the crash in .metadata/.log
I had same problem (Ubuntu 13.10 64-bit, Eclipse Kepler, Intel Sandybridge Mobile graphics) and this helped:
Put inside eclipse.ini:
-Dorg.eclipse.swt.browser.DefaultType=mozilla