Matt Boelkins, Lead Author and Editor; David Austin, Contributing Author; Steven Schlicker, Contributing Author.
Active Calculus.

Steven Schlicker, Lead Author and Editor, David Austin, Contributing Author, Matt Boelkins, Contributing Author.
Active Calculus Multivariable.

Feryal Alayont and Steven Schlicker
Linear Algebra: A Guided Discovery Approach (in progress).

Ted Sundstrom
Mathematical Reasoning: Writing and Proof.

Ted Sundstrom and Steven Schlicker
Trigonometry.