Bottom Panel by @yelloroadie.
Add a content panel below the main window. Useful if you want content to show constantly while the user is browsing, or if your content is too large for the SDK Panel module.
Panelview by @freaktechnik. Allows SDK-like creation of panelviews, which were introduced with Australis and are used by all the default buttons of Firefox.
OrderedMap by @madarche, a structure to hold ordered key/value mappings (like Python dict, Ruby Hash or Java HashMap) with a "max_items" option to delete oldest key/value mappings when maximum count is reached.