Q. Do you know why BibleGateway does not have the TNIV?
The TNIV (Today’s New International Version) was officially “folded into” the updated NIV in 2011. The TNIV, published in 2005 and produced by the same translation committee as the NIV, was essentially the third edition of the NIV, after the 1978 and 1984 editions. Previously Biblica and Zondervan were publishing the TNIV alongside the 1984 NIV, but now only a single edition of the translation, the 2011 update, is being published.
Harper Collins, which owns Zondervan, also owns BibleGateway, and in keeping with this policy it does not make the TNIV available on line. For those who still want to use the TNIV online, however, it can be found at BibleStudyTools. [Update: Unfortunately the TNIV is no longer available at this site, either.]
I have to admit that the translation remains a favorite of mine for its accuracy, readability, and especially its careful work in the area of gender accuracy, and I use it often. The Books of the Bible made its debut in the TNIV in 2007 before being reissued in the latest update to the NIV. The TNIV was used for other notable projects such as The Bible Experience, an audio recording of the Scriptures by leading actors. The 2011 update to the NIV incorporates most of the changes the TNIV made to the 1984 edition.