We've been homeschooling since 2005, and over the years we've used a wide variety of curriculum, and many times we've changed mid-year. To see what we've used (or at least planned to use at one time!), see the links below. I've link to the curriculum list for each grade level for each child so you'll notice that my children sometimes used different curriculum for the same subjects.
You can also read our general plan for math curriculum from kindergarten through high school.