This plugin allows you to programmatically create new custom types or add custom fields to existing types.

Scribit

Random

Random, a great plugin designed to insert random contents, posts and other types, into your website. Enjoy its shortcodes!

gilbarbara

Requird

Require users to fill selected fields before posting.

ceaksan

wpPostPageManager

Enables to add post type links (posts, pages, custom post types etc) and to change the titles in admin main menu.

davidlinnard

All custom types must currently be created in code since this was the easiest way to create it. The plugin ties in to the standard HTML and Image fields functionality within WordPress. Select boxes, checkboxes and 
standard text fields can also be created.
By having content in the code, you can do things like create dropdowns of other content easily, as well as make migration between environments easier (example code is supplied).

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