Any URL shortener’s main purpose is to shorten a long URL into a short URL.
URL shortener are criticized by many bloggers because sometime they are used for bad purpose but their popularity never gone down. Now you can create your own URL shortening service as TechCrunch and Gigaom use their own URL shorter.
Tinyurl.com is I think oldest URL shorter on the earth, bit.ly is blessed by Twitter so now it is most busy URL shortener. Ow.ly and tr.im are other famous services.
Some URL shortener need to open an account before using them and others you can use without opening an account.
This URL shortener is from Google, it provides analytics. some other useful features.
Linkbee is now lnk.co, you can make money by this softener, it provides analytics too, if you are logged in.
This shortener is form MCafee, MCAfee is an antivirus maker so you can trust on them and share a secure URL.
Custom URL shortetning with password protection and visitors limit.
It is also a simple URL shortener.
You can know your visitors and traffic analytics and search engine friendly.
Inspired with Twitter.
Simply shorten, track and manage your URLs.
This is from stumbleupon.com. You need to sign up to use this service.
A simple URL shortener with custom link.
Another good URL shortener.