webmention 
webmention is a go library and command line tool for assisting in sending webmentions.
Install the library by running:
go get willnorris.com/go/webmention
To install the command line tool, run:
go get willnorris.com/go/webmention/cmd/webmention
License
This library is copyright Google, but is not an official Google product. It is available under a BSD License.