Hipposite is an ultrafast unblocker, though it is know not to always work.
However, when it does it is very fast indeed.
HippOS is a work in progress OS simulator in the web. If you know of things like Terbium, it will be similar.
It is not really public yet, but you might find it.
Paint Bucket Pushcarts is an old project of mine that is being reborn.
It is very much in it's infant stages, so it kinds sucks.