Intro to Philosophy OER question

[Matt Evans]

What are the best OER textbooks or other materials for teaching an Intro to Philosophy course framed around debates on different topics like logic, arguments, god's existence and problem of evil, free will, philosophy of mind, ethics, theories of knowledge? Ideally the OER materials would bring up different arguments and counterarguments on these topics in a way accessible to an introductory course.

Thanks,

Matt Evans