If you are involved with open-air museums, chances are that you have heard of EXARC. If you are not, EXARC is an organisation for open-air museums (or individual archaeologists) with an emphasis on experimental archaeology.
They have published a journal, EuroREA, since 2004, and recently made the transition to an online-only journal. Now that the hardcopies have sold out (or almost), the archives have been made open and public in form of .pdfs. You can delve into it from here.
And this, I believe, is also the place to express my total appreciation of and joy over that choice - it can be really (nastily) hard to get hold of an article that is behind a high, well-defended paywall or not on the 'net at all, and only available in some very few copies in some select libraries.
So: Thank you so much, EXARC! I hope that many other journals will follow suit.