We recently added the ability to add Custom SSO providers for our corporate customers.
This means you could plug into shibboleth, create a LinkedIn or SalesForce login, or any other authentication provider that uses oAuth or SAML.
If this is something you're interested in using we'd love to work with you to set it up in your app to ensure everything is working correctly. Just get in touch here or at support@knackhq.com.