Fun Fonix: Phonics worksheets for kids
Newsela: An incredible resource with free articles for all age levels, all subjects.
Spelling Training: Spelling 1-4 grade
Scholastic Learn at Home
PBS Kids: You can sign up for the newsletter here. Totally free.
Story Starter: Randomly generates 356,300,262,144 story starters
Novel Effect: Novel Effect makes storytime a little more fun for kids (and grown-ups too!) As you read out loud from print books (or ebooks!) music, sound effects, and character voices play at just the right moment, adjusting and responding to your voice.
Free Children Stories: Free stories online ages 3-12
Words Their Way (Paid Subscription): a spelling program that is intended to be engaging and hands on, focuses on patterns within words, and reinforces many sounds and syllable learning we see through WRS. Overview document that explains the program in more detail and highlight what is taught in each book of the series: https://www.dropbox.com/s/8r1e8zfi52lesl0/Words%20Their%20Way%20Overview.pdf?dl=0
Wonderopolis: Short videos and readings that answer various burning questions for students. There are vocabulary challenges and comprehension questions.
RAZ KIDS (paid subscription -- perhaps they will go free as other companies are doing). One of the top.