Tang Math
This website has tons and tons of resources for teachers teaching math. During student teaching, both of my placements were given weekly/bi-weekly packets full of puzzles. Some of these puzzles included math crosswords, conversions of different measurements, and snake puzzles. The students loved these puzzles!
Dreambox Learning
Dreambox is a great resource for students as it is personalized as well as is an incredible way for teachers to gather data and teach accordingly. With so many different learners in the classroom, this platform allows for differentiated lessons and opportunities for all!