Smart Tourism (SmartTourism 2023) -- The concept of smart marinas for the implementation of Croatian nautical tourism -- A Decade Bibliometric Analysis of Decision Making in Tourism and Hospitality -- Smart Touristic Ports - The emergence of sustainable marinas from Smart conversion. What future for Sardinia's ports -- Assessing Management Effectiveness: Manglares El Salado Fauna Production Reserve study case -- Smart and slow tourism in protected natural contexts -- Spatial Energy planning, city and Urban Heritage (Spatial_energy_city 2023) -- Conservation and regeneration for a sustainable and circular city -- Problem setting on energy risk and climate change adaptation: topics and tools -- The role of spatial circular planning in urban governance. A set of indicators to evaluate performance of urban regeneration -- Theoretical and Computational Chemistry and its Applications (TCCMA 2023) -- Protein tetrahedral networksby invariant shape coordinates -- Guided Clustering for Selecting Representatives Samples in Chemical Databases -- Thermodynamic Analysis of Digestate Pyrolysis Coupled with CO2 Sorption -- Coding Cross Sections of an Electron Charge Transfer Process: analysis of different cuts for the entrance and exit potentials -- Transport Infrastructures for Smart Cities (TISC 2023) -- Sustainable retrofitting of urban streets for mitigation of traffic vibration by means of anti-vibrating trenches -- Some remarks on automatic braking system related to pedestrian safety -- Potential Application of Marble and Crushed Mussel Shells By-Products to be Used as Aggregates in Plain Concrete Mixes -- Impact Indexes Comparison Study Using Environmental Product Declarations (EPDs) on Innovative Cement Bound Granular Material Pavement Layers -- THE EFFECT OF SUBGRADE CAVITY ON PAVEMENT. A CASE STUDY -- Motorway performance in Europe and Greece -- Execution Time Experiments to Solve Capacitated Vehicle Routing Problem -- Analysis of the impact on the safety and sustainability of vehicular traffic in the landside area of Olbia - Costa Smeralda- airport -- INTERNATIONAL DESIGN PRACTICES FOR ROUNDABOUTS -- Urban Regeneration: Innovative Tools and Evaluation Model (URITEM 2023) -- Decision support system for the management of interventions on buildings in the historic centre of Florence: from conservation to regeneration -- Knowledge as a prodromal action for urban regeneration and sustainable development: the case study of Munici-pality of Fondi -- Metabolic Approaches to Regeneration of the Historic Mondeggi Villa Estate -- Environmental and Landscape Constraints and Legislative Provisions in Territorial/Urban Planning and Building Constructions: impacts in urban regeneration -- Urban Space Accessibility and Mobilities (USAM 2023) -- Accessibility and Polarities of Pedestrian Network in University Campuses. A Space Syntax Application -- A data-driven approach for a city-university mobility plan: the case of the University of Pisa -- Developing a parsimonious classification of traffic analysis zones using a large number of accessibility indicators and transportation level of service -- Research Trends in Tourism Participation: A Bibliometric Analysis using the Scopus Database -- Describing and Understanding the Morphology of the Urban Landscape. The Case Study of Cagliari, Italy -- The Emergence of Robotics in Tourism and Hospitality: A Bibliometric Analysis from 2017 to 2023 -- Sustainability crossing the city: developing a sustainable infrastructures system for Genoa urban center -- Virtual reality and augmented Reality and Applications (VRA 2023) -- An exploration towards sustainable metaverse systems for e-learning by student designers: A meta-analysis -- Design and Develop of a Smart City Digital Twin with 3D Representation and User Interface for What-If Analysis -- Numerical simulations of 1461 and 1762 San Pio delle Camere (L'Aquila) earthquakes using 3D physic-based model -- Graphical visualization of phase surface of the Sprott type A system immersed in 4D -- Open metaverse with open software -- Aerial and terrestrial LiDAR: comparisons and accuracies -- Workshop on Advanced and Computational Methods for Earth Science applications (WACM4ES 2023) -- Exploring the Signature of the Apollo Medicane in the Central Mediterranean Sea through Multi-Source Data Analysis: Satellites, Radar HF, Marine Buoys, and Seismic Data in October 2021 -- (Pseudo-)3D Inversion of Geophysical Electromagnetic Induction Data by Using an Arbitrary Prior and Constrained to Ancillary Information -- Transportation infrastructures exposed to seismic risk: evaluation of social costs for resilience design -- LOW-COST GEOMATICS SURVEYS FOR EMERGENCY INTERVENTIONS ON CULTURAL HERITAGE. THE CASEOF HISTORIC WALLS IN CAGLIARI -- AGEO: Advanced Citizens' Observatory for Atlantic Geohazard Risk Management -- Multidisciplinary research at the Castle of Santapau (Licodia Eubea, Italy): new data for the research, protection and enhancement of the archaeological site.

This nine-volume set LNCS 14104 - 14112 constitutes the refereed workshop proceedings of the 23rd International Conference on Computational Science and Its Applications, ICCSA 2023, held at Athens, Greece, during July 3-6, 2023. The 350 full papers and 29 short papers and 2 PHD showcase papers included in this volume were carefully reviewed and selected from a total of 876 submissions. These nine-volumes includes the proceedings of the following workshops: Advances in Artificial Intelligence Learning Technologies: Blended Learning, STEM, Computational Thinking and Coding (AAILT 2023); Advanced Processes of Mathematics and Computing Models in Complex Computational Systems (ACMC 2023); Artificial Intelligence supported Medical data examination (AIM 2023); Advanced and Innovative web Apps (AIWA 2023); Assessing Urban Sustainability (ASUS 2023); Advanced Data Science Techniques with applications in Industry and Environmental Sustainability (ATELIERS 2023); Advances in Web Based Learning (AWBL 2023); Blockchain and Distributed Ledgers: Technologies and Applications (BDLTA 2023); Bio and Neuro inspired Computing and Applications (BIONCA 2023); Choices and Actions for Human Scale Cities: Decision Support Systems (CAHSC-DSS 2023); and Computational and Applied Mathematics (CAM 2023).