Way back in time, I used the Online Bible. That was its name, though it was a DOS program, and had nothing to do with the Internet. I guess 'online' meant 'on the computer'? It was, and remains a free program, though it has long since been rewritten for Windows. It's written by a guy in Ontario, who I
think is Plymouth Brethren; it includes the Darby version.
Other free Bible software include Davar, e-Sword, QuickVerse, theWord, and WORDsearch, and I'm sure there are others. The free ones all include the KJV and possibly some other free versions, but any copyright version must be purchased.
This guy is giving away QuickVerse and tons of other Bible software on CD, but you must pay for shipping, and only the current offering is free; there is a new CD offered each month.
In the past I also purchased and used Logos. The one I currently prefer is e-Sword.