Blend4Web CE is a free and fully-featured solution which allows you to create open source 3D web applications.
GPL license is all about sharing. Anybody (including your competitors) can legally install your solutions developed using Blend4Web CE on their websites to be used for their purposes. Thus, this option is best suited for non-commercial use, such as for educational purposes, research projects, prototyping, portfolios, etc.
For fast and easy installation we provide the Blend4Web CE SDK which includes everything you need for application development.
Also we provide reduced version of Blend4Web CE as a standalone Blender add-on.
Proceed straight to download page and start using Blend4Web CE for free.
If you need a professional solution suitable for enterprise applications, consider using Blend4Web PRO instead.