Welcome to the WebGUI bazaar. Here you can download add-ons, enhancements, documentation, and miscellaneous wares that the WebGUI community has created. Most of it is free, but some of it you have to pay for. When you buy something from the bazaar, you're not only supporting WebGUI, but the community of people behind WebGUI.
If you happen to be one of those cool people who has created something for the community, then just log in and you'll be able to add to the bazaar and sell your wares.