From SHB Online
Gold Open Access: Author pays a fee upon publication; then article is free to readers permanently.
Hybrid Journals: Subscription-based journals, but articles can be made OA and free to everyone if the author pays a fee (these are sponsored articles).
Green Open Access: Posting of a manuscript/article (pre or post print; with or w/o peer-review) to an institution or repository (file sharing sites) by the publisher or author. It’s free to both author & reader; relies on subscription model.
Open Archive: Articles from subscription based journals are made freely available to non-subscribing readers after an embargo period (access is delayed to non-subscribers.) In this model, the subscribers have covered cost for non-subscribers.