We are not Salesforce Native. Everything built on the Force.com platform is data-centric. SpringCM is document-centric, which allows us to do much more with your information. Our team has worked with Salesforce to create a beautiful integration that allows you to start in Salesforce and stay in Salesforce throughout the entire contract cycle.
For more on the pros and cons of Salesforce Native vs. Non-Native applications, take a look at this blog post.