There is no escape...believe it or not. Mathematics is everywhere.
We have created a free repository of math questions at www.STEMcollection.com. Up to date, there are slightly over 3000 questions in the repository, all of them created by teachers and shared under a Creative Commons licence.
If you would like to participate, you can:
Sharing your questions can earn your institution a free licence for the WIRIS suite for mathematics: www.wiris.com/en/news/free-wiris-licenses.
Looking forward to your collaboration,