1. Open source web apps often struggle to maintain a "Try it" server. The interesting thing here is that Sandstorm (through our package ecosystem and demo server) makes that easy for any open source web app, and this is an example of that.
2. Since I wrote the code that powers that link, I thought it would be a great thing to "Show HN", per https://news.ycombinator.com/showhn.html "Show HN is a way to share something that you've made on Hacker News."
That's better - thank you. We (the community) just saw this as "Is it spam?"
Sorry - I thought you were a new account. I'm using the chrome extension "Hacker News Enhancement Suite" and it highlights yours in a very-similar-color-to-newbie-color.
I personally wrote the code behind Sandstorm's "appdemo" feature, which is what the "Try it now" button links to, from the Etherpad front page. Etherpad itself is not written by me; it's written by many other great people.
One other possibly-cool thing is that any open source web app, when packaged for Sandstorm, can get a "Try it now" button of your own. That's what I explain at https://blog.sandstorm.io/news/2015-02-06-app-demo.html but I figure it's worth stating clearly here in a comment, to save people a click.