Neoaxis is now free to use with all features.

http://www.neoaxis.com/news/neoaxis_3d_engine_is_now_fully_free

...Except source of engine core and tools.

NeoAxis 3D Engine is available in 3 editions, each providing a different level of access to the engine's source code.

Free Edition — free development environment, which includes all features of the engine and tools. Includes the ability to expand the engine by creating add-ons.
Professional Edition — includes the full source code of the engine's tools and bigger access to the source code of the engine components.
Source Edition — includes full source code of the engine.