Well it looks like the eScape people are doing an online version of their system, but it took a bit to find the link to the proper page to find the extension file[s].
There is a Windows version and an "i386 .deb" version. Both are dated as "2009-06-05"
The help page "Prerequisites" list you need Windows but leave out Debian Linux.
http://www.infogridpacific.com/igp/AZARDI/eScape%20-ODT2ePub/eScape%20Help/
The download page:
http://www.infogridpacific.com/igp/AZARDI/eScape%20-ODT2ePub/
A quote from the web site about the online service:
eScape - ePub Creator
Make fully conforming ePubs from Open Office Documents
ANNOUNCEMENT: Coming in February 2012 eScape Online. Create ePub 2,
ePub3 free, with options for Mobi KF8 and bookmarked RGB PDF from
*.doc, *.docx and *.odt wordprocessor manuscripts.
The desktop version of eScape will be withdrawn at that time. More
announcements on this exciting new service for small and
self-publishers will be made shortly.