For a simple cloak you can use countless free tools, they all work the same using iframes and similar. I myself made a cloaker which is also a landing page cloner/builder. While a normal cloaker uses iframes and creates an "empty" site containing only a redirect, i wrote this which actually creates a real site "on-the-fly". This is important for SOME uses, especially PPC/Adwords if you want a good quality score (since its a real site).
But for other uses (eg. just encoding/hiding your link) a simple cloaker should be enough.