Is there a working library that lets me create files in MS Excel format?
OpenOffice calc would be good in addition, but the primary requirement
is that we can create excel documents on the fly, and on a non-Windows
platform. This should work by either filling an excel template or by
creating an excel file from scratch with all the required formatting and
filled-in data.

This is possible in perl, but since we decided to implement that web
application in RoR, I would prefer to do this with Ruby.

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