BrainPop en Español The curriculum is comprised of short, animated movies as well as games, quizzes and interactive features in Spanish. Users practice the four principle language skills: listening, speaking, reading and writing.
Colorín Colorado offers resources for families that can be used for distance learning with English learners. They also appear to be growing their collecting of resources in response to the COVID-19 school closures, so more resources for distance learning may be available in the future.
CommonLit is a collection of reading passages in all literary and nonfiction genres for grades 3–12. Reading passages are available in Spanish.
Duolingo is a free language acquisition tool that is extremely similar to Rosetta Stone.