Social networks https://www.blend4web.com/ru/article/146/
The development is in Russia (documentation and support both in Russian and in English).
Seriously simplifies the work of artists (about programmers do not know the artist).
Anyway out of the box allows to make an adequate pipeline.
What the site says )
Overall, not a game engine (no some fici designer scenes)
No network engine out of the box (only the implementation from a programmer from the community https://www.blend4web.com/ru/forums/topic/492/?page=1)