It&#x27;s definitely not in private beta, because I also just signed up.  It&#x27;s a bit confusing because you don&#x27;t enter a password -- you just enter an email address.  They then assume that you want to authenticate via github to use that email.<p>Since Heroku&#x27;s famous pivot, there have been a few companies that have built online web (and other) development collaborative development environments, including <a href="https:&#x2F;&#x2F;www.nitrous.io&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.nitrous.io&#x2F;</a>, <a href="https:&#x2F;&#x2F;codio.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;codio.com&#x2F;</a>, <a href="https:&#x2F;&#x2F;c9.io&#x2F;" rel="nofollow">https:&#x2F;&#x2F;c9.io&#x2F;</a>, <a href="https:&#x2F;&#x2F;codenvy.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;codenvy.com&#x2F;</a>, and <a href="https:&#x2F;&#x2F;koding.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;koding.com&#x2F;</a>. There&#x27;s also the more scientifically oriented environments like <a href="https:&#x2F;&#x2F;www.pythonanywhere.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.pythonanywhere.com&#x2F;</a>, <a href="https:&#x2F;&#x2F;wakari.io&#x2F;" rel="nofollow">https:&#x2F;&#x2F;wakari.io&#x2F;</a>, and <a href="https:&#x2F;&#x2F;cloud.sagemath.com" rel="nofollow">https:&#x2F;&#x2F;cloud.sagemath.com</a>.  I don&#x27;t think any have had breakout success yet.<p>Of the above, at least <a href="https:&#x2F;&#x2F;c9.io&#x2F;" rel="nofollow">https:&#x2F;&#x2F;c9.io&#x2F;</a> and  <a href="https:&#x2F;&#x2F;cloud.sagemath.com" rel="nofollow">https:&#x2F;&#x2F;cloud.sagemath.com</a> are open source.<p>Disclaimer: I wrote <a href="https:&#x2F;&#x2F;cloud.sagemath.com" rel="nofollow">https:&#x2F;&#x2F;cloud.sagemath.com</a>, which is why I watch this space.