“0MQ version 0.4 was released today:
http://www.zeromq.org/area:download-v04
Most importantly, version 0.4 is the first 0MQ package to be licensed under LGPL, meaning that you can use it in your closed-source application with no need for a commercial license.
Secondly, version 0.4 works on several new platforms, inlcuding Windows (most wanted feature according to the poll), AIX, HP-UX, OpenBSD and QNX Neutrino.
0MQ team would like to thank Alexej Lotz for help with QNX port, Frank Denis for OpenBSD port and George Neill for AIX port.
Enjoy!”