LinkedIn Learning is a great resource that, as I understand it, is provided to you for free by Augustana, and covers a wide range of subjects, likely including a language you might wish to learn.
Stack Overflow is always a helpful resource to utilize, both to find sources for learning, and to ask questions. This one will apply to any language you can think of, and is definitely the number one of any resource I have ever used while learning programming.
Personally, I have more experience with less structured learning. Nothing motivates me to learn a new language better than a project I am interested in, whether it is for a useful application or just something I am determined to complete. This approach takes some shopping around based on your personal interests.
If you're looking for something more structured, edX is an aggregate for free open courseware provided by some well known universities.
Additionally, almost every language has a manual open to the public for free. These manuals could be your greatest resource for learning a new language on your own.
Of course, different learning methods appeal to different people, and I think it's great that you're asking for resources!
As you look around, I think you might notice that a lot of courses like this aren't necessarily specific to one language. This is, to my understanding, because learning a language is really not a course-worthy thing in and of itself. As a sweeping generalization: basic computer science concepts don't really change between languages, they just put on a new face.
An analogy for you: A language is like a carpenter's hammer. There are lots of types of hammers, each with their own specific uses and quirks, but at the end of the day, they are all hammers. What really matters is the person using it, and their goal.