Quiet book- button up jacket, Developmental book 20x20cm / The developing book.
Writing letters in salt (this site has Montessori & Montessori-inspired activities).
fine motor activity
Here is a simple counting activity for children, especially preschoolers. Simple to set up it can suit individual needs and develops fine motor skills.
Sorting and Counting bottles for mathematical play - could just focus on the colour element until ready to do counting
motor skills practice
Simple preschool color matching activity that will also work on fine motor skills -- pushing colored popsicle sticks into an old coffee can!
Sensory "play" for developing fine motor skills and letter/number familiarity eye/hand coordination - eye tracking and "copying." So good for so many skills!