Downloading MacTopos Mississippi 3.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This software for Mac OS X is an intellectual property of James Associates. The software lies within Education Tools, more precisely Reference.
From the developer:
Horseback ride, hike, and backpack in Natchez Trace National Historical Park. Mark the spot where you caught that prize-winning catfish in the Delta Region. With MacTopos, enjoy Mississippi at its best! James Associates, Inc., producer of MacGPS Pro software, now offers MacTopos Mississippi for the ultimate topographic digital map solution.
You may want to check out more Mac applications, such as SGDVLite, which might be related to MacTopos Mississippi.