Dimensions is a linked research data platform, including information on publications, research funding, patents and clinical trials - all on an international scale.
Dimensions includes citation data, research analytics features and a way of filtering through scholarly content such as publications, patents clinical trials aggregated for various registries, and grant information.
Dimensions has integrated tools to create Co-author Network Visualisations
For co-author visualisations, data can be extracted from Scopus with individual searches.
These instructions step you through the process.
Flourish is an online tool that offers a wide range of data visualisations including Chord Diagrams.
A free account is available for educational purposes which allows unlimited projects including visualisations and a wide range of templates.
Flourish - https://flourish.studio/
Chord diagram made using templates available in Flourish
For co-author chord diagrams - use the instructions on this page to extract author data from Scopus