A month ago, I found GenerationX, an open source Mac OS X GEDCOM editor. (GEDCOM is a standard genealogy file format.) Unfortunately, the version I found was very old. It was PowerPC-only and crashed on launch on Snow Leopard.
I took the source on SorceForge, fixed many of the compiler and static analyzer warnings and removed the expiry code.
You can find my fork on github:
https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fgithub.com%2Fpaulschreiber%2Fgenerationx
Be careful — this is still beta quality.
I had the rare misfortune of being one of the first people to try and implement a PL/1 compiler. -- T. Cheatham