Good LMS for managing content on a password-protected site?

I am building a set of tutorials for our company, which is a SaaS platform.  My boss would like them to live on our regular servers, so that clients only have to log in once for everything (log in to our platform, use our platform, watch a tutorial, then use our platform again, without having to re-login to anything).  I've been reading a lot of great LMS discussion threads here, but most of the products seem to require users to register/make an account.  Does anyone know if there is a good LMS that will let me track usage but still integrate with our existing login system?  Thank you!

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