1. Osher Lifelong Learning Institute (OLLI) at UCI offers a wide range of non-credit courses and programs for adults aged 50 and older. You can find their course listings on their [website](https://olli.uci.edu/).
2. Santa Ana College Community Education offers a variety of non-credit classes and workshops, including language courses, fitness classes, arts and crafts, and more. Check their [website](https://communityeducation.sac.edu/) for current course offerings.
3. Irvine Valley College Community Education offers a variety of non-credit classes and workshops, including culinary arts, dance, photography, and more. You can find their course listings on their [website](https://www.ivc.edu/communityed/).
4. Orange County Department of Education Adult Education offers free or low-cost classes in various subjects, including English as a Second Language (ESL), citizenship preparation, and career development. Visit their [website](https://www.ocde.us/schools/adult-education) for more information.
5. Local Community Centers: Many community centers in Orange County also offer adult education classes and workshops. Check your local community center's website or contact them directly for information on their course offerings.
6. Online Course Platforms: There are also several online course platforms that offer a variety of adult education courses. Some popular platforms include Coursera, Udemy, and edX.