Linux file conversion

One of my friends who runs a fiction website uses a Linux server to 
allow people to upload various types of text files directly to his 
server and automatically convert them to the markup his site uses. I 
don't know the full details, mainly because I have all the programming 
acuity of your typical chihuahua who has just had a portion of his brain 
pierced through with a spike.

Anyway, I was wondering if anyone knew if there was a way to allow him 
to convert .odt files (the Open Document format used by OpenOffice.org 
2.0) directly -- such as a general C++ application for that sort of 
thing that he can tweak to his needs.

Michael Hopcroft
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