A publisher that describes itself as supporting the “library industry” has created an on-line reference source intended to help English-language learners in middle and high school. The materials include nonfiction articles that can be searched by English-proficiency level, search tools designed for ELLs, and guides to support comprehension.
The publisher, EBSCO Publishing, offers ELLs or their teachers a free trial of the resource. I learned about it from The Journal, an on-line publication about using technology in education.