libde265 could be run on Linux, Windows, Mac OS ans iOS. A Mac OS X and iOS application will be released soon.

Yes, we help you with libde265 installation, development, porting to other platforms and its API.

libde265 HEVC is licensed under GNU Lesser General Public License, version 3 (LGPL-3.0). More information on Open Source Initiative GNU - Lesser General Public License
http://opensource.org/licenses/lgpl-3.0.html

We do not have a roadmap published on the libde265.org web site yet but we are definitely committed to release a development roadmap. Stay tuned.