Vessel

An automation programming system based on plugins and events.

• A workflow is a tree of user-entered steps with an optional input trigger.
• A step is a single logical operation in a workflow, such as “print to console” or “send a tweet” or “modify each item”. It takes an input and returns an output. Plugins add to the library of steps a user can pick in their workflow.
• An input trigger* is a block of code that listens for an input (button press, HTTP request, etc) and generates an output that gets sent into a workflow. This code always runs (as long as there's a workflow that wants it to). * A plugin is a bundle of code that generates steps and input triggers**.