Unity
Unity is a multi-platform game engine which was released in June, 2005 and has been used in many games ever since. It is a commonly used engine, especially with games that are developed for mobile devices.
Contents
Tools
There are quite a few tools circling around for ripping assets from Unity games.
AssetStudio
A tool for exploring and extracting from Unity Asset files. You can rip models, sounds, textures and some more with it. Its GitHub repository can be found here.
UABE
UABE stands for Unity Assets Bundle Extractor. It contains the bare minimum for extracting things from Unity games. Its GitHub repository can be found here.
Tutorials
There currently are no tutorials here. Please stay tuned. Alternatively, you can try writing one!