The Occupational Outlook Handbook provides detailed information about occupations as well as labor market information such as projected job outlook and salary data.
O*Net offers information about specific occupations with a variety of search features to help you easily explore different careers. 
My Next Move offers an O*Net Interest Profiler to assist you in discovering your interests and seeing how those interests connect to different careers.
Career One Stop is a website created by the U.S. Department of Labor that features information about identifying your skills, values, and interests in addition to information about different occupations.
CareerLocker, is a career planning tool with assessments and information about job searching and careers. It can be accessed by 1)logging into MyUW, 2) searching for WISCareers, and 3)choosing the WISCareers button.
What Can I Do With This Major? is a resource about the different potential occupations and employers for each major. It also offers specific strategies for how to get further involved in that field and includes other resources for further research on those fields.
What Can I Do With A Major In…, developed by the University of North Carolina at Wilmington, includes information and resources for a variety of majors.
The Guide features information about all the majors and programs offered at UW-Madison.