I recently finished working through Adventures in Group Theory and really appreciated the use of SageMath it employs. I considered myself moderately proficient with Sage, but I found working through the examples to be enormously beneficial to my understanding of Sage's capabilities.
To that end, I was curious to hear of other suggestions for mathematics texts that include work in Sage? Preferably ones accessible to undergraduates later in their degree or to newer graduate students.
@Moo rightly suggests you look at the list of books on the SageMath website. There are many more for specific disciplines in mathematics, such as Beezer's linear algebra text or Stein's undergraduate number theory text - and more to come, including one by yours truly not quite unleashed. Our publications issue list currently has several others hot off the presses, though not all those necessarily have lots of Sage directly in them; many just have some supplements or worksheets with Sage material.
That said, let me suggest a couple specific generalist ones you will probably find useful.