Right now, there's no way to tell a demo from a library from the website (that we've been able to find) without checking the "related" tab of the hub entry and seeing if it says "related demo" or "related library". Some sort of icon in the game updates forum, a (demo) or (library) indicator in the title of the posts, or some sort of indicator on the main hub entry itself (perhaps have it say "[demo/library] by [author]" would be convenient.