Students at Northern Essex Community College in Lawrence and Haverhill can now access certain digital textbooks, courseware and materials on the Lumen Learning platform for free. This is in addition to the free open source materials the college began offering students in 2014. Northern Essex is one of just seven colleges in the state selected to participate in the Digital Textbook and Materials Pilot program. The Massachusetts Department of Higher Education approved a million-dollar grant shared by the seven schools to access digital textbooks, courseware, and materials on the Lumen Learning platform at no cost to students, college officials said.