Very few free sites exist anymore, that have regularly updated info on auditions. Those that do usually have amateur auditions posted on them, and not so much the paid ones. Unfortunately, the last few years have seen more and more people cotton on to the idea that you can sell subscriptions to actors, etc, in order to let them view wanted ads. (Buyer beware: some sites I believe, take advantage of a certain naivete that people have, and no site should be used as a replacement for good old fashioned research and promotion that you should be doing anyway)

I'm not familiar with a site that includes a reference to 'blue'... Unless you're thinking of a theatre company that posts their auditions on their site. I know of pretty much all of the theatre-related news/jobs websites for Australia and it doesn't ring a bell.

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There is a UK site called The Blue-room, but it is technical and a little insular.A similar but more relaxed site is ControlBooth, from the US.