AniCel

Unity 2017 supported.
AniCel is a package designed to help you achieve the perfect cel-shaded look for your projects, inspired by Japanese art and animation.
These shaders focus on bringing out a hand-drawn style to really enhance the colour and life wherever they're used.
Download the free preview application
The package includes a Standard AniCel shader, which allows a huge variety of customisation and control for your cel-shaded effects, as well as an outlined variant.
There is also an Ukiyo-e shader, designed to mimic the styling of traditional Japanese art.
These shaders have all been tested on Android, and are supported on any system with Shader Model 3.0 or equivalent.
Please note that the Unity 4 version of these shaders are much more limited than their updated counterparts, and use an older shader structure.
The models used in the screenshots and demo are by BBSoftware & Snowball ENT and are available for free on the Asset Store.