ANSI University Outreach Program
https://www.ansi.org/education_trainings/university_outreach
ANSI's outreach program educates and advises faculty about standards in the classroom and in curriculum. Through this program, faculty and students can get complimentary access to a defined group of ISO or IEC standards for the duration of a course.
ASHRAE Read-Only Standards
ASHRAE offers free, read-only access to a select number of their "current popular standards" and standards referenced in code.
Incorporated by Reference (IBR) Standards Hosted by ANSI
https://ibr.ansi.org/Standards/Default.aspx
This ANSI portal provides free access to select read-only, full-text standards incorporated by reference in U.S. federal regulations.
National Institute of Standards and Technology (NIST) Free Standards List
http://gsi.nist.gov/global/index.cfm/L1-5/L2-44/A-466
NIST offers a list of standards bodies that make some or all of their standards free, or free with membership.