
AWS Data Exchange
6.2#1 in data exchange platformsFree planFree planWebAPI
Visit

It suits data subscribers looking for free or provider-priced data products, and providers who want to publish products or private offers. It can also serve people seeking publicly available Open Data on AWS, whether or not they have an AWS account.
Harbr suits organizations operating data marketplaces or exchanges, including utilities, public-sector groups, data providers, and health and life sciences organizations. It supports platform operators, data sellers, and human or AI data consumers.