Ser:
http://www.drlemon.com/Grammar/ser.html NOTES
http://www.learnspanishfeelgood.com/verbs-ser-present1.html
http://www.learnspanishfeelgood.com/verbs-ser-present2.html
http://www.quia.com/quiz/408027.html
http://spanishtechbook.weebly.com/ser-practice.html
Estar:
http://www.drlemon.com/Grammar/Estar.html NOTES
http://www.proprofs.com/quiz-school/story.php?title=estar-practice
http://www2.vmi.edu/academics/modl/bulger-barnettkb/estar.htm
http://www.quia.com/quiz/303454.html
http://www.spanish.cl/Grammar/Games/Verbo_Estar_Presente.htm
http://www.phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=jcd&wcsuffix=0214
Ser/estar:
http://www.studyspanish.com/verbs/lessons/piserestar.htm
http://www.studyspanish.com/lessons/serest1.htm
http://www.studyspanish.com/lessons/serest2.htm
http://www.studyspanish.com/lessons/serest3.htm
http://www.studyspanish.com/lessons/serest4.htm
http://www.learnspanishfeelgood.com/verbs-ser-or-estar1.html
http://www.learnspanishfeelgood.com/verbs-ser-or-estar2.html
http://www.learnspanishfeelgood.com/verbs-ser-or-estar3.html
http://personal.colby.edu/~bknelson/SLC/ser_estar.php
https://www.stolaf.edu/people/hansonr/spanish/ser-estar/index.htm