We are a very small team and rely on maintainers to actively look after a frontend. For example Chris does a brilliant job keeping the Amiga frontend in shape and I keep GTK going. Other frontends like Windows, RISC OS and Atari lack a maintainer altogether and are kept going purely through inertia.

Unfortunately the Mac OS X frontend became unmaintained some time ago and eventually stopped working altogether which resulted in its removal from the master branch and hence releases.

There was some activity by Sven earlier in the year ( http://source.netsurf-browser.org/netsurf.git/log/?h=svenw/c... ) but it was not ready to be included and I think he lost interest again.