How to Learn English in Levels (online book with three levels)
How to Learn English – level 1 - News in Levels (World News for Students of English)
English news and easy articles for students of English
Grammar in Levels - the most important English grammar
Wikipedia with simple English: Scroll down on the Wikipedia page to find different topics for easy reading:
“People and Social Studies” “Natural Sciences and Maths” “Daily Life, Art & Cultures” “Applied Sciences”