.Net Core 1.0 has supports: C#, F#, VB, and now PowerShell. This means dotNet Core is available on Windows, macOS, and RHEL/Ubuntu http://www.hanselman.com/blog/NETCore10IsNowReleased.aspx There isn't a killer OSS .Net Core project yet but will there be?
So, which agency put these free USB charging stations in all the airports? :) Most people must not consider that they are plugging in the same way they might sync. "We'll give you some battery charge if you let us hack you!" voluntary data sharing [photos.app.net]
How not to build an app: http://daringfireball.net/2016/08/vesper_adieu Gruber's postmortem of why Vesper's failed to make money is brutal and honest. I wonder, though, would rapid releases of iOS also hurt them all the more after Brent (developer) left.