http://www.nagare.org/
Regarding the type of product and the use of the structure, think about Facebook (it’s not exactly a social network, but close enough to evaluate in this context).
Basically, I'm just looking for something reliable, scalable, easy to work (a small learning curve is a plus), compatible with older browsers and well integrated with other technologies (for example, Postgres, if there is no convincing case to be made for Cassandra?).
Other framework / tools I have a little recommended or recommended:
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