There was a port in FreeBSD called "devel/adabooch" which installed the 2003 version of the Ada95 Booch components. There was no building done, only the source files were installed. Ada95 Booch is actually well-maintained at SourceForge by Simon Wright and Martin Krischik. The latest version came out in March 2013.

FreeBSD now builds this version, including a full library and standard .gpr support, and should be in great shape now.