But there's no need for them in these forums and they will not be permitted here. Besides being a waste of time they can also be abused to hide the destination URL, or to include ads or malware to make money for the person providing the link.
I want URL's here to be as transparent as possible. If you use a shortened or redirected URL in a post here your post will be edited or removed. Please PM me to discuss having your post restored.
And if you need a shortened URL for other purposes, I recommend goo.gl (run by Google, free, no ads, no malware, no sign-up required). For example, if you need to send someone a short URL to direct them to Halo Fixes, you can use "goo.gl/SL86HF".