I'd like to be able to customize the Okta-verified Bookmark App to allow for conditional redirection based on user group rather than a single URL. First, I'd like to find out how an application like the Bookmark App is coded and submitted to Okta for inclusion in the Okta Application Network. Second, I'd like to know if the source code for the BookMark App is available on GitHub.
There is currently not a way to have the Bookmark app redirect based on a conditional. You can generate a feature request to have that functionilty added. The Bookmark app is provided by Okta so it was not a submission from another source. The source code is generally not available outside what you find on GitHub.