Use case: Putting a link in your pages (e.g. blog posts or newsletters) to make it easier for your readers to share it on Hacker News. It is open source.
So, it works like the HN bookmarklet?
Yes, that's the inspiration. The difference is that this one generates a link (rich or plain text) that can be put in a web page. It doesn't require the audience to have bookmarklet installed.