See especially #2 for recommendation that parental input be considered when determining whether a six year old who has never attended K should enroll in K or 1st grade
See especially #8 for recommendation that districts establish standards for children who are age eligible for K but enroll in TK instead
Tools
Flipgrid lets students record videos. It's so simple that even kindergarteners can navigate it.
VoiceThread allows multiple users to record comments in a slide show. This could be used for collaborative assignments or assessment.
Spark lets users create professional looking videos with ease.
Recommended Reading
Books
This book reveals how inequitable practices create achievement gaps for low income students
This book discusses the importance of making education and policy decisions based on research.
Research Articles
Barnard-Brak, L., Stevens, T. & Albright, E. (2017). Academic red-shirting and academic achievement among students with ADHD. Contemporary Educational Psychology, 50, 4-12.
Bassok, D., & Reardon, S. F. (2013). "Academic redshirting" in kindergarten: Prevalence, patterns, and implications. Educational Evaluation and Policy Analysis, 35(3), 283-297.
Gottfried, M., Le, V., & Datar, A. (2016). English language learners and kindergarten entry age: Achievement and social-emotional effects. Journal Of Educational Research, 109(4), 424-435.
Hover, A. B. (2015). How student enrollment in kindergarten readiness classes affects future academic achievement. Journal of Research in Education, 25(1), 57-68.
Huang, F.L., & Invernizzi, M. A. (2012). The association of kindergarten entry age with early literacy outcomes. The Journal of Educational Research, 105, 431-441.