Avaialable in the icons forum.
Iconset Maker (Updated) - Icons - Directory Opus Resource Centre (dopus.com)
Iconset Maker Pixel Perfect (Updated) - Icons - Directory Opus Resource Centre (dopus.com)
Both have been made V13 dual mode compatible and iconified.
The difference between them is
Iconset Maker uses montage to scale the images and does not do dual mode iconsets.
Iconset Maker Pixel Perfect does not scale images, and can do dual mode iconsets.