I have developed a port of Obsidian for FreeBSD. However, this port will not be built by the official FreeBSD package building cluster, because software license doesn’t allow redistribution.
Creating a package for Obsidian boils down to unpacking the .tar.gz release archive and then packing it back into FreeBSD .pkg archive.
It’d be great if Obsidian EULA would allow redistribution, even if only for packaging sake.