Read: tar, pax, cpio, zip, xar, lha, ar, cab, mtree, rar, and ISO images.
Write: tar, pax, cpio, zip, xar, ar, ISO, mtree, and shar.
I believe it had tar compression detection significantly earlier than GNU tar too.
There are generic tools like "unar", but it's interesting that in the BSD world tar grew those features instead. An odd counterpoint to the accusations of "bloat" often leveled at GNU.
e.g. instead of:
440K gtar
151K gcpio
144K unzip
655K libarchive.so.6
57K bsdtar
37K bsdcpio
20K unzip