Packages make Pulsar do amazing things.
haskell-hoogle
Lets you look up the marked text on http://www.haskell.org/hoogle via context menu, toolbar item and the exposed command haskell-hoogle:lookup.
image-preview
Preview images embedded in html, css, sass, scss, less, or markdown files.
language-applescript
AppleScript language support for Atom. Converted from https://github.com/textmate/applescript.tmbundle.
language-gfm2
Syntax highlighting and snippets for GitHub Flavored Markdown (GFM), with Liquid support.