Feel free to add your own to this list. I did not make this list, it was posted in the homeschooling area of CafeMom and I have not updated this list, I have used several of these links and others however.
You might find some of these links helpful to supplement what you are using:
Preschool through 6th:
http://www.starfall.com (Free learning site, preschool to 2nd grade)
http://www.handwritingforkids.com (Free worksheets)
http://www.enchantedlearning.com (Free learning site with purchased membership)
http://www.abcteach.com (free learning site with purchased membership.)
http://www.earlychildhoodlinks.com (links to lots of sites)
http://www.kn.att.com (has some learning links)
http://www.first-school.ws (free preschool stuff)
http://www.wxdude.com (Meteorology studies)
http://teacher.scholastic.com (some free worksheets and activities)
http://www.tlsbooks.com (LOTS of free stuff-no membership required)
http://www.auntlee.com (Free games and activities)
http://www.dltk-kids.com (Lots of ideas and activities)
http://kidsites.com (links to lots of sites)
http://www.letteroftheweek.com/index.htm… (Free curriculum for preschool to age 8)
Elementary to Junior High (A few have activities suitable for High School supplementation)
http://www.mathsisfun.com (free activities and games)
http://www.coolmath.com (free activities and games)
http://www.funbrain.com (Free games and activities)
http://www.brainpopjr.com (Games and activities, membership required)
High School to college level:
http://ocw.mit.edu/OcwWeb/Global/all-cou… (free courses, advanced high school to college level)
http://www.free-ed.net (free courses, high school level to college level)
http://www.hoagiesgifted.org/online_hs.h… (High School courses)
http://www.freeuniv.com/ (high shcool and college level)
http://www.laits.utexas.edu/fi/index.htm… (Free French Lessons on line. Covers French 1 and 2).
http://www.donnayoung.org (Lots of free homeschool helps, links to some free software, educational fonts, schedules for popular curriculum, record keeping forms, etc.)
http://themathworksheetsite.com (Math worksheets, membership fee required)
http://www.worldbook.com/wb/Students?cur… (a guide to help you decide what to teach when, shows what is typically taught in each subject, at each grade level).
http://www.dorioakes.bravehost.com (free emergency curriculum)
http://oldfashionededucation.com/fullcur… (Free curriculum, uses lots of public domain, on-line books).
http://www.freelyeducate.com/ (a blog that passes on free educational sites)
http://justinguitar.com/en/BC-000-Beginn… (Free guitar lessons, uses detailed printed information along with You tube video to present a complete guitar course, totally free!)
Mom Talk is a group for moms to come for advice and should be looked at as a more supportive community than Mom Confessions. Those who aren’t here for drama but want to connect with other moms or have questions about parenting can hang out here.