I have a list of free printable websites -
Depending upon what you're looking for, there is a listing of free math, reading, and spelling content at http://learningabledkids.com/multi_sensory_training/free-multisensory-curriculum-online.htm. The other two that come to mind are Ambleside Online and Easy Peasy.
The only one I knwo of is easy peasy.
There is easy peasy as already mentioned and lesson pathways (I think is still free).
There is also another option... Find a objectives list for each grade level. I know world book has one. Then use the library and internet.
There is the Core Knowledge Series that the local library should have. It has an outline of what should be learned each year as well as some of that material in the book.
There is Pinterest that has tons of free creative ideas.
There are a ZILLION websites out there that are helpful and too many to list here.
Good luck! The others have given so great resources!