Google translate app what are all the languages available?

I answer your question with procedural manner. 

Google translate app what are all the languages available?

No, all the languages are not available in Google translator but in near future others language will be included. 

How accurate is it?

I think it's 50% accurate because machine cannot able to convert natural languages fully. 

what are the other software available as a competitor to Google?

Babylon Translation Software.

Hi,

The Google Translate app has 64 languages available. For the most part of it, you can translate texts through copy & paste. And 15 languages can also be translated via voice. It can translate from English to French, Spanish, German, Portugese and a whole lot more. This can also be done from your preferred language to English.

Some other free translation websites are:

http://www.freetranslation.com/

http://www.worldlingo.com/en/products_services/worldlingo_translator.html

http://www.free-translator.com/