There is a free preschool and kindergarten curriculum at
http://preschool.earlyknowledgeforkids.org. The curriculum is laid out in sections and days, so you just go section to section and day by day. It has text with links to videos, games, coloring pages and worksheets. The curriculum covers science and social studies. The curriculum is still in progress but there is probably enough right now to last a couple of months. "Only parts of the curriculum are available at this time. The complete curriculum should be finished by the summer of 2012. New sections will be added regularly."
You can also download free educational magazines in PDF format from
http://www.earlyknowledgeforkids.org/ that are aimed at elementary age children.