A hugely popular free/donationware, open-source software, useful for downloading & managing an e-book collection, and for converting e-book files to different formats. Format conversions available are from CBZ, CBR, CBC, CHM, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, TCR, & TXT to EPUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, TCR, & TXT. Note however that a range of problems may occur with such conversions, including reflow and pagination errors. Calibre can be used as an e-reader too for most e-book formats, but not if they are encoded with DRM (digital rights management proprietary protection). A very large number of additional features are included in this software. Other, often customisable highlights include strong library/catalogue organisation, and structured downloading including Fetch News (for free newspapers and periodicals in many languages). The open-source community continues to create additional plug-ins for Calibre. You can also use Calibre to publish your own (non-DRM) e-books, e.g. by converting a PDF or plain text book you have previously created to the format you desire for publication.
Download from: http://calibre-ebook.com/
Lexxia: Scripts for Producing Quality PDF and HTML Files from Plain Text
These free, open-source scripts will convert (almost) plain text to very high-quality PDF or ePub documents. Note that the latter are extractable to HTML by renaming the epub files with a “.zip” extension, unzipping them and pulling out the HTML files. Classic book examples are available here too. Thanks to a retired academic from Macquarie University, Sydney.
Download from http://www.limpidsoft.com/
As the name suggests, this is a website offering free conversion of e-books online. You may change a range of book formats into most other formats, including ePub, PDF, LIT, MOBI, LRF, TCR, OEB, FB2, and PDB. For an improved conversion outcome you may also specify your e-reader device type. Please note and respect the conditions of use, including non-violation of copyright, restrictions on the nature and quantity of content etc.
convert online http://ebook.online-convert.com/
If you need to create a printable PDF from a Word document, this fast and free software (the free, more limited version of NitroPDF) is worth checking out. A 7MB download, for Windows XP, Vista and Windows 7 OS’s.
Convert online http://www.primopdf.com