Quark

A free and open source URL shortening, file sharing and pastebin service.

• Free. Quark is not only free to use on the official instance but is also free to download and run for yourself.
• Open Source. All of Quark's source code is available here for the community to take a look under the hood. We also accept community contributions, just open a pull request!
• Multi-purpose. Unlike other mainstream URL shorteners, Quark also provides file sharing and a pastebin also with short links.