Someone who knows nothing of Autobahn has a hard time understanding
what it actually is from the description of these packages.
The WAMP acronym is never expanded or explained. I do not know at all
what you want to convey with the "Caller", "Callee", ... bullet list.
Here's my stab at a long description, based on text from http://autobahn.ws:
Autobahn|Cpp provides an implementation of the WebSocket and Web
Application Messaging (WAMP) protocols.
WebSocket allows bidirectional real-time messaging on the Web and
WAMP adds asynchronous Remote Procedure Calls and Publish &
Subscribe on top of WebSocket.
Autobahn|Cpp is open-source, licensed under the Boost Software
License. The API and implementation make use of modern C++ 11 and
new asynchronous idioms using (upcoming) features of the standard
C++ library, in particular Futures, Continuations and Lambdas.
<Package specific description here>