Tobii has a collection of SDKs, listed below, that are mainly intended for developers who wish to develop desktop applications that use eye tracking for gaze interaction.
Tobii Stream Engine
Stream Engine is the lowest level eye tracking API supplied by Tobii and it is mainly intended for advanced users. Stream Engine provides low-level access to eye position, gaze point data, presence and head pose data streams.
Interaction Library
The Interaction Library is a lightweight library that makes it easy to use gaze for interaction. It also provides robust eye tracker connection management and easy access to standard data streams.