calibre - Ebook manager, viewer & converter
CBconvert - A comic book converter with support for .cb*, .pdf, .xps, .epub, .mobi and directories.
Convertio - File Conversion in the Cloud
csBooks - News & Books and Office & Productivity
SwiftConverter - Online file conversion software. Convert images, audio, video, documents, and 3D files.
Any eBook Converter - Any eBook Converter is a perfect DRM removal tool for removing DRM from eBook files and convert Kindle, Adobe, Nook, Kobo to DRM-free file, like epub, mobi, pdf, azw, txt and kfx.