TL:DR; 100% managed version of ZLIB compression library.
100% managed version of ZLIB compression library. Full C# source code is included.
TeeChart Charting Controls for Xamarin.Forms offer the most common chart types, gauges and maps with customizable tools for data visualisation in mobile applications.
Barcode Professional for Silverlight. High quality vector-based Linear, Postal, MICR, Composite and 2D Symbologies. Visual Studio&Expression Blend support. Silverlight printing data-binding support. Save barcode images in image files.
NOV Gauge for .NET has extensive support for instrumentation widgets such as radial (circular) and linear gauges, knobs, indicators and numeric displays.