I highly recommend Accordance Bible Software. The company prioritizes the development of original language resources and works hard to produce quality, reliable software the first time.
I no longer recommend Logos Bible Software. I loved it for years, was frustrated with it for years, and finally sold all of it I could. Logos has some wonderful people working for them — several of whom are friends — but the company’s focus and my interests parted ways. You can find my posts in their forums if you want details. I do, however, still use the software a few times a week because they have Croy’s Greek grammar, which is one of the grammars I teach from, and they also have Steve Runge’s and Rick Brannan’s and Ken Penner’s awesome work. If it weren't for Accordance — and especially the way the program developed between versions 10 and 11 — I would probably still be using and recommending Logos.
Both Accordance and Logos have recently released free versions of their programs, and I think this is fantastic. Now, the top two Bible software companies have free versions that give the average person studying the Bible what they need most — a searchable text — and both platforms allow users to expand their electronic libraries to their hearts' content.
When many people first consider Bible software, they just want a searchable English Bible. But they know there is this thing out there called Bible software that promises to help them in many more ways than by simply providing a searchable text. They know they will likely want more in the future, but for now they just want a free searchable text. Now, they can take that first step with either or both of the two best options. They can explore and see which one they like better, and if the time comes to expand, they will already have the two best options on their computer — or more likely their tablet and phone.
Check them out yourself: