There are a lot of MOOCs (Massive Open Online Courses) nowadays that offer CS theory. For example, Coursea has an algorithm class available (https://www.coursera.org/course/algs4partI).
Coursera, etc. offer great resources for learning CS. I think Roughgarden's sequence https://www.coursera.org/course/algo is better than Sedgewick's, because it's targeted at upper division rather than lower division students and is language neutral.
On the other hand, Coursera etc. fall into a bit of a grey area regarding "outside of college". Though I tend to think that limiting the options to outside of college doesn't get the OP much.
MIT also offers classes as well (http://ocw.mit.edu/index.htm).