Martin.Holy 

A collection of platform-independent utility classes for .NET applications, providing essential extensions, data structures, event handling, logging, file and IO helpers, and simple in-memory database support.

Cross-platform UI library. Includes CollectionView, TreeView, TabControl, dialogs, MediaPlayer, ZoomAndPan controls, and other UI helpers.

Android-based library that extends the platform-independent MH.UI library by integrating it with Android and providing additional utility classes, controls and resources.

Modern WPF UI library. It provides a rich set of controls including TreeView, CollectionView, TabControl, dialogs (MessageDialog, InputDialog, ToggleDialog, ...), media playback (MediaPlayerControlPanel),... More information