You can download these plugins from Piece of a Puzzle.
These plugins were developed before releasing BBSlit, so these are not slittable.
Note: These plugins are developed by a Japanese BB4W user, and he/she distributed these plugins at an anonymous BBS about one year ago. Now these plugins are archived by Piece of a Puzzle, but the webmaster is not developer of these plugins, so you shouldn't ask him question or suggestion about these plugins.
These plugins can be in the slit by BBLoSlitta.