Skia is described as 'open source 2D graphics library which provides common APIs that work across a variety of hardware and software platforms. It serves as the graphics engine for Google Chrome and Chrome OS, Android, Mozilla Firefox and Firefox OS, and many other products' and is an app in the Development category. There are four alternatives to Skia for Linux, Mac, Windows, Android and Python. The best alternative is Cairo, which is both free and Open Source. Other great apps like Skia are PlotDevice (Free, Open Source), Anti-Grain Geometry (Free, Open Source) and Aspose.Drawing for .NET (Paid).
Cairo is a software library used to provide a vector graphics-based, device-independent API for software developers. It is designed to provide primitives for 2-dimensional drawing across a number of different backends.
Anti-Grain Geometry (AGG) is a high-quality 2D rendering library written in C++. It features anti-aliasing and sub-pixel resolution. It is not a graphics library, per se, but rather something to build a graphics library upon.
The drawing engine supports rendering vector graphics (such as lines, curves, and figures) and text (in a variety of fonts, sizes, and styles) onto raster images in all commonly used graphics file formats. Can be used in web, mobile, desktop, cloud and IoT scenarios.