https://www.abcya.com - ABCYa is a favorite! It has both math and literacy activities.
www.earobics.com - This website focuses on reading and phonics skills.
http://www.handwritingworksheets.com - Create your own handwriting practice for your child.
www.kidzone.ws/math/kindergarten.htm - This is a math website with lots of patterns and number skill practice for kindergarteners.
http://www.readwritethink.org - This also focuses on English Language Arts and has age appropriate activities.
www.softschool.com - SoftSchool has fun games that touch on a variety of math concepts.
https://www.starfall.com - Starfall has fun math and literacy games.
http://www.superkids.com - Super Kids has a variety of fun activities.
https://gregtangmath.com/games - Fun math games
https://www.mathlearningcenter.org/resources/apps - Online math manipulatives such as ten frames, number racks, geoboards, and pattern blocks