Most tasks formerly accomplished by concordances can now be done with a search on scriptures.lds.org There are instances where the printed versions are superior. The the lds.org search doesn't work try Eldin Ricks's Thorough Concordance of the LDS Standard WorksBX 8620.02 .R422e 1995
by Paul Hoskisson 1992 Entry in the Encyclopedia of Mormonism
There are many single volume commentaries but here are listed only the mutli-volume sets. All of these are available in the Religion/Family History Reference Collection. Some might be available in full-text on GospeLink
7 volumes 1961. One of the earliest Book of Mormon scholars George Reynolds was also a member of the seventy and secretary to Brigham Young. Janne Sjödahl was a Swedish convert who worked in LDS periodicals.