Q Read - which is a paid application provides epub , PdF and mobi book support. .

There are a number of Text to Speech based readers. Paid and unpaid.. For me the best by far is  the free Speak On which has a range of excellent features for ePub reading in its confusingly  named  Text Publications app.

 This has  as  well as text ,  ePub support, including book marking , navigation levels, header and chapter navigation, on the fly control of book reading speed  and   volume and  including a range of other features. You can even create  a “virtual eBook” based on a search term which will pull out all the relevant sections of an ebook which is very useful for academic study. There is also full capacity to export to text to a word processor by simple copy and paste.

David Griffith