Kidzone, Tlsbooks and School Sparks are three websites that offer tracing printables for free, and they're designed for kids in preschool and kindergarten. Many tracing printables are designed to help kids learn to write the letters of the alphabet, draw lines and draw shapes. Others are for tracing an entire picture, such as one of a boat or animal, andthen coloring it in.
Kidzone has printable worksheets for tracing curved, straight and zig zag lines; circles; and full drawings such as animals, flowers, stars and hearts. Tlsbooks offers printables for tracing lines, animals, boats, insects and holiday-themed items. School Sparks' worksheets focus on teaching kids to trace each letter of the alphabet in both lower and upper case.