One of the questions that I get asked from time to time is "What’s the Mac equivalent of Casemap?"  While there is not a program that exactly corresponds on the Mac side, one of the most viable options is MacJournal.  There is a good review of MacJournal at the MacLitigator blog which analyzes its pros and cons and explains why he prefers it over Journler.  You can check it out here.

Source: "MacJournal and Replacing Journler" by Peter Summerill, published at his MacLitigator blog.