An Dutch company called RDG Kompagne sells software package Gebarenblik (Canned Signs) developed by Handicom, see their English product description. It is also sold by inTAAL.

Their logo (left) seems rather elaborate to indicate a simplified sign system?

It is an application to help the teaching and learning of Weerklankgebaren. This is a set of about 1000 signs (with images, pictograms and the like) which are quite similar to this Simplified Sign System from the US. You could buy a book (50-60 euro), but this software (135 euro) lets you create on-demand practice material, practice on the computer, and play a memory-game.