Not sure why one would decide on using a framework because it is integrated with a few vendors that are popular at the moment. There is significant lock-in, and

Not sure why one would decide on using a framework because it is integrated with a few vendors that are popular at the moment. There is significant lock-in, and just because it is open source does not make it free. Lots of companies right now release client libraries that work only with their own remote server under a liberal license, giving the illusion of freedom.