Free electives can be courses at any level, in any subject area, from any faculty. Because they can be almost any course there is no list of all the possible free electives. If there is a specific subject area that interests you, try searching for courses in that subject area in the handbook.
Please note: You will only be able to enrol in courses that you meet the pre-requisites for, and/or are not restricted only to students in particular degrees. You are also unable to enrol in General Education courses offered by the Faculty of Arts and Social Sciences for your free electives.