
Annalisa
Crannell gives advice on "Writing in Mathematics Classes" and a "Checklist
for Grading Mathematical Writing". She has assignments for
PreCalculus through Calculus III each with a list of the emphasized concepts. 

Tommy
Ratliff has suggestion for administering writing assignments and has
projects for Calc IIII each with a list of emphasized topics. 

Gavin LaRose has dozens of assignments for Calc
I&II and Differential
Equations. 

Barry
Spieler gives a brief description of each of his Calculus assignments. 