Computer Science and Information Technology -- Zero Configuration Comfort and Accessibility in Smart Environments -- The impact of the evolution of Operating Systems on older Web Applications -- Method for Evaluating the Performance of Web-Based APIs -- Application of Traditional and Deep Learning Algorithms for Sentiment Analysis of Global Warming Tweets -- 3D Simulation and Comparative Analysis of Immune System Cell Micro-Level Responses in Virtual Reality and Mixed Reality Environments -- Developing a 3D Laparoscopy Training Application to Assess the Efficacy in Virtual Reality Environments -- Collaborating with Agents in Architectural Design and Decision-Making Process: Top-down and Bottom-up Case Studies Using Reinforcement Learning -- Health Technology and Medicine -- 5G and IoT for Intelligent Healthcare: AI and Machine Learning Approaches- A review -- Experience of Visually-Impaired Children in the Enjoyment of Cartoons -- A review of wearable sensor patches for patientmonitoring -- Enhancing Student Well-being: the Impact of a Mindful-ness-Based Program (Mind7+) on Stress, Anxiety, Sleep Quality, and Social Interactions in a sample of Portuguese University Students -- Algorithm for Diagnosis of Metabolic Syndrome and Heart Failure using CPET Biosignals via SVM and Wavelet Transforms -- Meal Suggestions for Caregivers and Indecisive Individuals Without a Set Food Plan.

This book constitutes the refereed post-conference proceedings of the 9th EAI International Conference on Smart Objects and Technologies for Social Goods, GOODTECHS 2023, held in Leiria, Portugal, during October 18-20, 2023. The 13 full papers included in this book were carefully reviewed and selected from 30 submissions. They were organized in topical sections as follows: designing, implementing, deploying, operating, and evaluating smart objects and technologies for social benefit.