Deltamath: Practice assignments with tutorial videos given occasionally by teachers
School 21: Extra practice and remediation for students preparing to take the Keystone Algebra 1 exam
Desmos: online graphing calculator, very user-friendly
Geogebra: Tool to help students interact with geometry in a very visual and interactive way, can also be used as a graphing tool
Khan Academy: tutorial videos and practice problems for various mathematics concepts
Virtual Nerd: tutorial video resources for grade 6 math to Algebra 2 and Geometry
Math Open Reference: reference and exploration tool for various mathematical concepts
IXL.com: practice and tutorial site for Algebra 1, Algebra 2, Geometry, and Precalculus