Nowadays, technology has become dominant in the daily lives of most people around the world. Technology is present from children to older people, helping in the most diverse daily tasks and allowing accessibility. However, many times these people are just end-users, without any incentive to develop computational thinking (CT). With advances in technologies, the abstraction of coding, programming languages, and the hardware resources involved will become a reality. However, while we have not progressed to this stage, it is necessary to encourage the development of CT teaching from an early age. This work will present the state of the art concerning teaching initiatives and tools on programming, robotics, and other playful tools for the development of CT in the early ages, explicitly filling the gap of CT at the kindergarten level. We present a systematic literature review evaluating more than 60 papers from 2010 to December 2020. The paper's amount was classified in taxonomy to show CT's principal tools and initiates applied to children early. To conclude this paper, an extensive discussion about the future trends in this field is present.