Review of Gramps powered by the Slant community.
Installation notes for the Mac OS version of Gramps can be found here.
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Pros
Pro Lots of available plug-ins increase functionality
Gramps offers a lot of additional free plug-ins to download to further increase functionality.
Pro Free to download and open-source
Cons
Con Difficult learning curve can be frustrating
Gramps is quite extensive and sophisticated, which makes it hard for beginners to learn how the software works. It can take quite some time to discover all the possibilities and a help section isn't present.