There are a few things that can be added to the site; please keep in mind that the adding-process is mid-construction, so this process will, hopefully, be overhauled very soon.
Siri Shortcuts
Shortcuts let you automate tasks with your favorite apps on Apple's various devices
UserScripts
UserScripts are JavaScript code that enhance your web browsing experience
Alfred Workflows
This could be a Workflow, Theme, or Snippet hosted over on GitHub