PowerBoots makes it easier for scripters to create graphical user interfaces in PowerShell, exposing much of the power of WPF to PowerShell in a simple syntax which supports events, threading, and much, much, more.
PowerBoots is written as a script module which dynamically generates functions into static script files for each WPF control, combined with a compiled module called PoshWpf which was originally part of PoshConsole (and includes the Out-Wpf cmdlet and New-BootsWindow cmdlets among others) ... the module enables threaded UIs as well as enabling support for styles, control templates and data templates.