shameless plug : I've been working on a document management system with an epub content type for some time and I'm releasing this quarter, follow me @keefe and

shameless plug : I've been working on a document management system with an epub content type for some time and I'm releasing this quarter, follow me @keefe and check it out... generally though, if you want to use something yourself you can use an arbitrary content management system like drupal, verify it has an output to txt and then look into epub builders, epub is a relatively simple format.