HMH Ed vs OpenSciEd

HMH Ed has no write-up on Specifiction yet; its figures are above.

OpenSciEd creates free science curriculum materials and professional learning resources for educators, with NGSS alignment across elementary, middle and high school. Its lessons center on scientific phenomena and student questioning, investigation and problem-solving; teachers are encouraged to adapt them. Released units can be downloaded as PDFs, Google Drive files, Word documents or PowerPoint files, and some are available in Google Classroom or Canvas versions. Free self-guided learning paths and an on-demand support library provide videos and resources for unit preparation, classroom routines and anticipating student ideas. Registration is required to access the materials and is intended for educators or parents, not K–12 students. Middle school materials use CC BY 4.0; elementary and high school materials use CC-BY-NC licensing, with noncommercial 5R permissions free and perpetual. OpenSciEd High School offers three NGSS courses. The organization describes itself as an independent nonprofit, and the website is listed for web access.