http://showalicense.com/
It is open-source on GitHub: https://github.com/IonicaBizau/showalicense.com
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I want to hear your feedback and contributions are more than welcome: https://github.com/IonicaBizau/showalicense.com#your-help-is-needed-heart
Here is an example using the querystring api:
http://showalicense.com/?fullname=Alice#license-mit
Thanks!