TinyURL - Are you sick of posting URLs in emails only to have it break when sent causing the recipient to...
Shlink - A self-hosted URL shortener
Kutt.it - Kutt.it is a free and open source URL shortener with custom domains and stats.
Lstu - A nice and open source url shortener. You can use it as service or install it on your own server.
Bitly - Get the most out of your social and online marketing efforts. Own, understand and activate your best audience through the power of the link with Bitly Enterprise.
Anonymous URL Shortener - Anonymous URL Shortener, Referer, Anonymizer, Redirection service.