Free learning
These are places online where one can study a subject for free. The 'qualifications' are worthless academically.
Coursera Wikipedia entry Very good, used it a number of times.
OpenLearn Wikipedia entry "the home of all free, open learning from The Open University".
FutureLearn Wikipedia entry a MOOC platform owned by the OU.
Udemy Wikipedia entry Seems a bit lightweight. Nothing useful relating to war or peace.
Codecademy Wikipedia entry Used it. Pretty good.