LUZ 

MultiSelectTreeView is a .NET/WPF control that displays a hierarchical tree of items that can be browsed, selected, collapsed and edited like in a normal tree control. This control overcomes some of the limitations that the TreeView control included in WPF has. Most prominently, it adds multiple... More information

Net.Xmpp is a multiplatform, Windows and Android, .NET XMPP client assembly. Net.Xmpp supports IM functionality and a variety of XMPP extensions, is simple and is extensively tested against Windows. It is a fork of the currently frozen excellent Sharp.Xmpp project.