Grammarly
Grammarly Blog: What Are Homophones?
This page explains homophones (words that sound alike, but have different spellings and meanings) and provides the most common examples.
Other
Using english.com: English Grammar Quizzes & Worksheets
A nice treasure trove of printable grammar worksheets organized by proficiency level: beginner, intermediate, and advanced. Emphasis is on parts of speech but you'll also find some that focus on common spelling issues and vocabulary...
Other
Meat, Meet, Mete at homophone.com
This short reference page provides clarification for the homophones meat, meet, and mete. The basic definition of the word homophone is also provided.
Online Writing Lab at Purdue University
Purdue University Owl: Exercise : Accept/except Spelling Exercise
This Purdue University OWL (Online Writing Lab) provides practice in applying the use of accept and except. L.11-12.2b Spelling
Online Writing Lab at Purdue University
Purdue University Owl: Spelling: Common Words That Sound Alike
Brought to you by the Purdue University Online Writing Lab, common words that sound alike are listed. Examples: we're, where, were; your, you're; conscious, conscience. L.11-12.2b Spelling