Not sure whether you mean to pull data locally from multiple ALs or pulling the data from weatherlink.com? (Presumably the latter since you mention the v2 API?) And real-time or archival too? And are these all ALs that belong to you or not?
But either way I'm not aware of any marketed (or shareware/freeware) software to do so as yet. It's not conceptually difficult for a developer to program, at least not once you can retrieve data successfully from weatherlink.com (if that's the route you want to use). But someone still needs to write the software and to deal with issues like data access limits, if that were to be a problem.
But maybe something does already exist and someone else knows better.
