Http Adapter framework – available outside Biztalk?

We have a Biztalk installation that needs to communicate with a partner over Http. This partner runs a LOB application and does not have Biztalk or its adapter infrastructure. They are having tremendous difficulty writing a Http receiver – sender which can work with two-way messaging patterns (request-response and solicit-response).

The best bet would be to install Biztalk on their side as well just for its Http Adapter framework and all its benefits out of the box (tracking, querying, etc) but the licensing makes this out of the question.

Is there a Http Adapter framework someone has written somewhere which we can reuse? It would be good if it has all the supplementary features like tracking, querying, transaction support, etc.

Thanks in advance.