Below is the review of Illustrative Mathematics High School curriculum by EdReports, which shows it receives the highest quality marks in each category under review. In addition this resources is entirely free for use.
Free of charge Kendall Hunt makes all materials available in Canvas course cartridge, which allows for all materials, assignments, and assesments to be delivered and organized on Canvas. In addition, by existing with Canvas this allows for each teacher to modify and change, exclude, or add to the curriculum as context, pedagogy, etc. dictate. Here is a brief video walking you through some pieces of the curriculum. It is not exhaustive or inclusive of all that the curriculum offers, but it is intended to show it located within the Canvas environment.
This fall we will be adopting the IM accelerated math program for 7th grade. One of the advantages of using an OER curriculum is that it allows other organizations to partner and build alongside of the curriculum. Khan Academy and GeoGebra, among others, have organized content alongside the pacing and scope of Illustrative Mathematics curriculum. Here are a three screenshots of how that looks. All of these aligned resources can be accessed at Khan Academy and at Geogebra.