Phoronix: IcedTea 1.3 Picks Up New Features, Support
Back during JavaOne 2007, Sun Microsystems had released the fully open-source OpenJDK that effectively made Java a free software language. Just weeks after that Red Hat announced the IcedTea project...
Does it work just a well the one that comes with the closed source Java?
No,even though it's improving. Try http://www.goproblems.com/prob.php3?nutrial=1&plevel=0 for example... with really recent releases you can go a bit further than before but it won't allow you to go to the next page once the problem is solved. However for amd64 that's the only game in town since Sun never released a 64 bit Java plugin.