From OpenStax by the Conservatory of Music at Brooklyn College of the City University of New York is licensed under a Creative Commons Attribution-ShareAlike.
The Stanford Encyclopedia of Philosophy organizes scholars from around the world in philosophy and related disciplines to create and maintain an up-to-date reference work.
Major areas of philosophy covered here are: Ethics, Epistemology, Metaphysics, Philosophy of Religion, Ethics, Socio-Political Philosophy, and finally, Aesthetics.
Introduction to Design Equity, an open access book for students and professionals, maps design processes and products against equity research to highlight the pitfalls and potentials of design as a tool for building social justice.
An Introduction to Technical Theatre by 
Introduction to Design Equity by