Are there any examples of solid, stable, cross-platform apps developed with Xamarin? I tried looking at their website, but it doesn't seem possible to tell the difference between apps being tested using Xamarin Test Cloud, and apps developed using the Xamarin Platform.

Probably most notably the Slack App: https://www.xamarin.com/customers/tech

There's nothing in that description that indicates the Slack app is written using Xamarin. From that link:

"Slack's friendly, easy to use messaging platform is the future of work. Given its preeminence in the enterprise and among mobile workforces, mobile is critical to Slack’s success. Over three million daily users rely on Slack to communicate with their teams, and Xamarin Test Cloud helps Slack make sure customers are productive in all scenarios. Its mobile quality engineers view test reports to see how features look and behave on devices — and can quickly solve customer issues."

Sounds like they just use Xamarin Test Cloud.

Here's a list of decent looking Xamarin apps:

- BitWarden (it's made the rounds recently on HN)[1]

- Microsoft Pix [2]

- A bunch of games that look pretty slick (I've downloaded a few and flipped through some of the screens) [3]

[1] https://github.com/bitwarden/mobile

[2] http://www.microsoft.com/en-us/research/product/microsoftpix...

[3] https://www.xamarin.com/customers/gaming