High School (list of links): http://www.homeschool.com/resources01/Electives.asp
Oak Meadow: http://www.oakmeadow.com/
NARS: http://www.narhs.org/
There are several more. I just googled "accredited high school homeschool" ... Jubilee, CompuHigh, Morningstar, Alpha-Omega Academy...many more...
Hope this helps!
Laura