Indigo plugins add all kinds of new functionality. Our 3rd party developers have created some amazing integrations that we know you're going to love. When using the search field, keywords will be OR'd by default. You can use a plus (+) sign before a word to require it for a match and a minus sign (-) to exclude.
We're still working with our 3rd party developers to get all plugins into the store. You may also want to look at the older plugin list on our forums if you don't see a plugin you're looking for.