The following is a list of full math courses, online and free:
Algebra 1: SAS Curriculum Pathways
Beginning Algebra: Saylor Academy.
Algebra and Geometry: Hippocampus
Algebra 1 Modules: From NY State Education Dept.
Algebra 1 Online: Henrico County Public Schools
Algebra 2 Online: Henrico County Public Schools
Geometry Online: Henrico County Public Schools
Algebra 1, 2, Geometry: Math Planet
Algebra 1 and 2: Open High School of Utah
Calculus 1: Mooculus.
Georgia Virtual Learning: This site has a number of online high school math courses that can be accessed for free.
Algebra 1: This is a full course, broken into modules, so you can use it in its entirety, or just the parts you want. The course includes lesson plans, with links to related Khan Academy videos, worksheets and assessments with their answer keys, and each unit ends with a real-world project.
Geometry: The course is modular, so it can be used to supplement an existing Geometry program, or serve as the main curriculum. It's project-based, emphasizing real-world examples, such as using Geometry to create architectural designs for an apartment or house, or designing a floor plan that maximizes open space and natural light.
Calculus: Covers Limits & Continuity, Derivatives, Applications of Derivatives, Integrals, and Applications of Integrals. Includes links to workbooks and videos.
Math Video Library: Visit Mathispower4u.com for video tutorials in Algebra 1 and 2, Geometry, Trigonometry, and Calculus.
(If you know of any other free math courses, please list in the comment section).