Kutt.it - Kutt.it is a free and open source URL shortener with custom domains and stats.
Itiny.in URL Shortener - Free URL shortening & link management service Created by iTiny.in
YOURLS - YOURLS is a website that contains all the tools you need to create and launch your very own URL shortener. URL shorteners like bitly or TinyURL are fine for public use, but they offer limited options in terms of URL customization.
UrlHum - The modern, privacy-aware URL shortener built with Laravel.
Polr - An open source URL shortener. A great non-profit and free alternative to bit.ly, TinyURL, or goo.gl.
1to.app - https://1to.app/ is the Advance URL Shortner.