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 Works BX 8620.02 .R422e 1995
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
