Our CRM portal connector is exactly that. It's the only solution that connects CRM to Sitefinity exclusively. Creating CRM forms, grids of data, etc. can be done completely through the Sitefinity interface. It has a very small footprint on CRM (only 4 custom entities) and we also have an awesome FetchXML builder as part of the platform for creating more complex grids and charts for your Sitefinity site.
This video gives a good overview of the solution.
And you can see all information including pricing and technical documentation at www.crmportalconnector.com Drop me a line if you have any questions email@example.com