Datacentral is a static site generator to easily publish and distribute datasets. It uses the Data Packages specification as a common format. By collecting datasets on this portal, we make it easier for developers to plug data into projects. See the Frictionless Data vision for more background.
For example data packages, browse the github.com/datasets organisation.
There is an online authoring and validation tool for data packages. On CKAN portals, the datapackager extension allows exporting datasets as data packages. You may be interested in using Goodtables.io and other tools from the Frictionless Data Labs.