The hugely popular PC bible software has been coded for the Ipad and has gone on sale for a nominal fee (4.99 US) in the Itunes store as eSword HD. The release is version 1, and only includes English modules (bible translations, commentaries, devotions, word study dictionaries, etc.) but we are all hoping for future versions with Greek and Hebrew, as well as more modules.
Longtime Bible Software Reviewer Ruben Gomez has produced a seven minute quick look at eSword HD for those interested:
As far as the free PC version, eSword is found here, with literally thousands of extra modules (the huge strength of the program) available for download from Biblesupport. There is also an Android adaptation available as MySword.