So after many hours spent on researching what is the most simple & stable solution covering all the needs (today’s & tomorrow’s) http://activebot.net is finally out…
What you may expect from it in the near future is actually what ABN concept stands for: a lot of re-usable apps talking to each other… 
But now – coming with modular & scalable API for apps/bots communications through several channels first to be supported:
- REST
- XMPP
… next to come – who knows