Hi Catherine. This is my advice as an English teacher. Iin order to improve your oral English , it is very important that you listen to and practise spoken English as often as possible to improve your English pronunciation. You can also click onto Language Partners and Language Teachers at the top of this page and email native speakers to set up a time to practise oral English. Click onto Groups and join one that you like to practise your pronunciation. These sites are also good for listening and pronunciation practice that Italki members recommend. http://www.bbc.co.uk/radio4/
 http://www.elllo.org/ http://www.bbc.co.uk/worldservice/learningenglish/ http://news.bbc.co.uk/ http://www.usingenglish.com/
 http://www.englishpage.com/
 http://www.sharedtalk.com http://www.tolearnenglish.com/
 http://www.oup.com/elt/global/products/headway/
 http://www.flo-joe.co.uk/
 http://wordweb.info

I think the best way is practicing with native english talkers or with someone experienced in the language, in this case softwares and other kinds are not so helpful at all. greetings