Duolingo

Free collection of audiobooks and short stories as downloadable MP3s with text passages and reading strategies, from the University of South Florida. Supports fluency and listening comprehension.

Adaptive grammar and writing practice that uses students' interests to build skills, with diagnostics and teacher assignments. A free plan is available, with paid tiers for more features.

Free writing lab from Purdue University with guides on grammar, research, citation styles (MLA, APA, Chicago), and the writing process. A standard reference for secondary writing instruction.

Free lesson plans, interactive student tools, and strategy guides for reading and language arts instruction, originally from NCTE and the International Literacy Association.