Probability Tutorials
Science, Math, Probability, Teaching Resources - Probability Tutorials. Tutorials in measure theory, lebesgue integration and probability, by Noel Vaillant.
http://www.probability.net/
The Laymans Guide to Probability
Science, Math, Probability - The Laymans Guide to Probability. An in-depth but easily readable guide on probability theory, covering various aspects of theory with a bias to gambling games.
https://www.probabilitytheory.info/
Applied Probability Society of INFORMS
Science, Math, Probability - Applied Probability Society. A subdivision of the Institute for Operations Research and the Management Sciences (INFORMS) concerned with the application of probability theory to systems that involve random phenomena.
http://appliedprob.society.informs.org/