Sun Grid Engine used to be open source, but now Oracle Grid Engine isn't. But what's far worse, in my opinion as a user, is that Oracle made many of the existing documentation and community support resources hosted by Sun disappear.
So as much as it pains me to say this, I can totally understand why Oracle have removed those resources because it's flies in the face of their business practices:
1. build something massively complex and counter intuitive to developer for and administrate
2. employ the best salesmen to encourage potential customers that your product is the most powerful and flexible tool out there
3. then charge your confused customers ridiculous support fees because they can't manage the solutions they've just bought
This is why my heart sank when Oracle bought Sun. The two businesses couldn't have a more different software culture (Sun Enterprises were, in my opinion, were one of the best for releasing open, well documented and well designed software)
People who make the purchasing decisions are finally fed up with Oracle's incompetence and utter contempt for the rest of the industry. It's a shame, but I won't really miss Sun when they're finally, mercifully put to death. I hate Oracle for what they did to that company and I wish nothing but ill toward them.
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By removing it, Oracle can lay claim to more professional services clients.
Or, it could just be incompentance on their end in maintaining the server...
Anyone know of other open-source resource managers out there?