Sheppard Software's Language Arts page features a variety of games.
http://www.sheppardsoftware.com/web_games_vocab.htm
Freerice is a website where students can answer vocabulary and grammar questions while helping to end hunger around the world.
http://freerice.com/#/english-grammar/1259
Newsela is an innovative way to build reading comprehension with nonfiction that's always relevant: daily news.
www.newsela.com
The PARCC website provides students with sample test questions and practice tests.
http://practice.parcc.testnav.com/#
Word Game Time provides students with word games, videos, and worksheets.
http://www.wordgametime.com/grade/5th-grade
Wonderopolis is a website where students can explore, read, and find out more about their curiosities.
http://www.wonderopolis.org/
Dogonews is an online source for current events, news, and non-fictional articles for kids.
http://www.dogonews.com/
Students take a blast through the past learning about world history on this site.
http://www.kidspast.com/world-history/
Kids enter ancient worlds, meet famous people, and discover fascinating facts by exploring a wide selection of historical games and activities on this site.
http://www.bbc.co.uk/history/forkids/