Color Pencils - I recommend the Prismacolor Sharpener. It removes less wood and you get two choices of for lead sharpening. Plus it has a covered lid so you can take it with you and sharpen anywhere with no fuss.
Slide Sharpener works great for square contractor pencils and charcoal sticks.
Steel Double Barrel Sharpener works great for chalk and regular pencils and keeps an sharp edge longer.
Old School Rotary is fun but will chew threw your expensive pencils quick so be mindful.
Traditional School Sharpener is inexpensive and has a shavings container but they tend to chew threw everything. Ones with double barrels are great for chalk!
If you are looking to snag any of these sharpeners head over to my tools for more information.