You have failed as a developer if your application cannot send me a file without errors. Slowly Ruby on Rails is becoming the next PHP where very second smartass developer fails at programming stable and functional sites. This rant also explains why Ruby is a failure on it's own.

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  China's Three Gorges Dam reservoir has been fouled by pesticides, fertilizers and sewage, and more than 600 kilometers of the Yangtze river are critically polluted
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• For Sale: One Useless Cat
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• Beware of XHTML
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• Google Reader Theme // journal // hicksdesign
  Great new theme for the google reader. CSS FTW!
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• Java examples (example source code) Organized by topic
  (tags: java development programming)

Alfresco looks like an finally usable, open-source and enterprise-grade Content Management System (plus it sounds tasty). It's Java and requires an Applicationserver, but that should be no problem as dedicated Linux servers are now reasonably priced. There are also certified versions with support, warranty and all the bells and whistles some Enterprises care about.
Alfresco does out of the box:

• Enterprise Content Management (ECM)
• Document Management
• Collaboration
• Records Management
• Knowledge Management
• Web Content Management
• Imaging

License: Mozilla Public License (MPL).