One of many spelling, vocabulary, and writing resources on the Vocabulary and Spelling City site, this page explains, "Asking a child to write about something that matters to him [sic] right now is a powerful motivator. This is where writing prompts come in. Writing prompts are simply ideas or subjects offered as a foundation for students to build a writing assignment on" (¶3, 2011.07.25). It includes tips for preparing writing prompts as well as examples for elementary, middle school, and high school students.
"We might be tempted to suggest Grammarly for students or learners of English, but the fact that Grammarly has nothing to say about so many of our intentionally incorrect sentences leads us to the sad conclusion that Grammarly is useless for everyone. Grammarly might improve, but as of early 2012, we can't in good conscience keep advertising it on our site." (Conclusion, ¶2)
This is "a collaboratively edited question and answer site for linguists, etymologists, and serious English language enthusiasts. It's 100% free, no registration required (Welcome! 2011.02.02).
"A capitonym is a word whose meaning changes based on whether or not it is capitalized" (n.d.).
Thanks to Sandra Nelson for pointing this out to the LearningwithComputers group way back when!