Anagram Builder (A Spelling Game)

Download Grammarly's browser extension.

It will help with:

(1) Avoiding spelling errors
(2) Correcting grammar errors
(3) Finding better words.

(The Grammarly extension works with webmail, social media, and texting apps as well as online forms and Microsoft Office documents like Word.) More info...
Get the grammar checker

"Smashing Grammar"
Written by the founder of Grammar Monster, "Smashing Grammar" includes a comprehensive A-Z glossary of essential grammar terms, a detailed punctuation section, and a chapter on easily confused words. Each entry kicks off with a simple explanation and some basic examples before giving real-life, entertaining examples.

Here's the killer bit: All entries end with a clearly worded summary that explains why the grammar point is relevant for a writer. If you like Grammar Monster, you'll love this book. More info...
See on Amazon

"Grammar for Grown-ups"
Vocational rather than academic, "Grammar for Grown-ups" is packed with real-life examples and keeps you engaged with a wealth of great quotations from Homer the Greek to Homer the Simpson. Straight talking and methodical, Craig Shrives draws on his years compiling Grammar Monster and as an army officer to present a comprehensive but light-hearted and easily digestible grammar reference guide. More info...
See on Amazon