Adobe Camera Raw
The free Adobe Camera Raw plugin adds Raw editing capabilities to Lightroom

Powtoon
Powtoon is a free Photoshop plugin that lets you turn your designs into animated video content with a single click.

Ultimate Retouch Panel
For professional retouching results that go beyond the default Photoshop filters, Pro Add-Ons’ Ultimate Retouch Panel(opens in new tab) is well worth a look.