Let's say that you want to deploy content from your staging site to production, or more generally, from one site to another (or multiple) sites. You could use Deployment, but what if you prefer a pull model over a push model? Then Syndeploy is for you. Changes are published via a feed, and then other sites can slurp them in. The slurping portion is to be handled by a corresponding Feeds processor plug-in.
A small module for processing tokens containing in a field in a context of a node. Can be used, for example, for generating various documents from templates.
Webhooks are "user-defined HTTP callbacks". They are usually triggered by some event, such as pushing code to a repository or a comment being posted to a blog.