What is "appveyor"

AppVeyor is a hosted, distributed continuous integration service used to build and test projects hosted at GitHub on a Microsoft Windows virtual machine.

AppVeyor is configured using a Web UI, or by adding a file named appveyor.yml, which is a YAML format text file, to the root directory of the code repository.

Visual Studio Online includes AppVeyor integration.

On 12 November 2014 Microsoft released many parts of their .NET Framework as open-source on GitHub, and AppVeyor integration was added to some of these repositories.