Yellowfin Marketplace, while others can be developed by third-parties.
Connectors come in the form of a
.yfp package, which contains all the files required to create and use the connector. Connectors can be packaged on their own, or with pre-built sample content. Sample content may include Views, Reports, and Dashboards.
See Plugin Management for more information on different types of plugins.
Some generic instructions can be found below.