Kutt.it - Kutt.it is a free and open source URL shortener with custom domains and stats.
Piar.io - Create beautiful custom link previews for all your social media channels in one place
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.
Peeklink - Customized Link Previews for 🔥 Posts
Polr - An open source URL shortener. A great non-profit and free alternative to bit.ly, TinyURL, or goo.gl.
Linkz.ai - Automatic rich link previews on hover that keep visitors on your website