Hardware and Software 2D Rendering Library
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Hardware Rendering Technology:
1.1 OpenGL ES 2.0 + AA Shader: This based on OpenGL ES2 and Its Shading Langauge (GLSL).
1.2 SkiaSharp GLES Backend
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Software Rendering Technology:
2.1 Agg-Sharp
Agg-Sharp is the C# port of Anti-Grain Geometry (AGG) version (version 2.4, BSD license)
This provides 'classic' (pure) software based rendering technology.
Big thanks go to to https://github.com/MatterHackers/agg-sharp
2.2 SkiaSharp
2.3 GDI+ , System.Drawing: as usual :)
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PixelFarm's Typography : Agg's Subpixel Rendering
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License:
Source code from multiple projects, here...
BSD, 2002-2005, Maxim Shemanarev, from http://www.antigrain.com , Anti-Grain Geometry - Version 2.4,
BSD, 2007-2014, Lars Brubaker, agg-sharp, from https://github.com/MatterHackers/agg-sharp
Apache2, 2016-2017, WinterDev, from https://github.com/LayoutFarm/Typography)
Apache2, 2014-2016, Samuel Carlsson, from https://github.com/vidstige/NRasterizer
MIT, 2015, Michael Popoloski MIT, from https://github.com/MikePopoloski/SharpFont
The FreeType Project LICENSE (3-clauses BSD style),2003-2016, David Turner, Robert Wilhelm, and Werner Lemberg and others, from https://www.freetype.org/
BSD, 2009-2010, Poly2Tri Contributors, from https://github.com/PaintLab/poly2tri-cs
MIT, 2016, Viktor Chlumsky, from https://github.com/Chlumsky/msdfgen