Windows 10 build 9841 (fbl release)

This build is the first publicly available build of Windows 10. If you want to get this build then you can do it here. (Note: file size > 3 GB)

If you want to be able to use the reporting feature you will need a Microsoft account and your system requires at least: 1 GHz or faster processor, 1 GB or more RAM (for x86) or 2 GB or more (for x64), at least 16 GB of HD space. If you're installing this on a physical device you will also need a DirectX 9 graphics device with a WDDM driver. That said, on a physical device is not recommended. Either use a secondary PC or a virtual one. The screenshots below (to be uploaded here later) were taken in VirtualBox.

Screenshots
This build was demoed on 2014-09-30 and released on 10-01 to Windows users only. Note that it refers to itself only as 'Windows' or 'Windows Technical Preview'.