[Abstract] In this paper we aim to bring some order to the myriad of tools that have emerged in the field of Artificial Intelligence (AI), focusing on the field of Machine Learning (ML). For this purpose, we suggest a classification of the tools in which the categories are organized following the development lifecycle of an ML system and we make a review of the existing tools within each section of the classification. We believe this will help to better understand the ecosystem of tools currently available and will also allow us to identify niches in which to develop new tools to aid in the development of AI and ML systems. After reviewing the state-of-the-art of the tools, we have identified three trends in them: the incorporation of humans into the loop of the machine learning process, the movement from ad-hoc and experimental approaches to a more engineering perspective and the ability to make it easier to develop intelligent systems for people without an educational background in the area, in order to move the focus from the technical environment to the domain-specific problem.This work has been supported by the State Research Agency of the Spanish Government, grant (PID2019-107194GB-I00 / AEI / 10.13039/501100011033) and by the Xunta de Galicia, grant (ED431C 2018/34) with the European Union ERDF funds. We wish to acknowledge the support received from the Centro de Investigación de Galicia “CITIC”, funded by Xunta de Galicia and the European Union (European Regional Development Fund-Galicia 2014-2020 Program), by grant ED431G 2019/01Xunta de Galicia; ED431C 2018/34Xunta de Galicia; ED431G 2019/0
