ExtremeTech has rounded up their 10 favorite free plug-ins for tweaking digital images in Photoshop. All of the plug-ins are available for Windows computers, while about half are Mac-compatible. From light effects to dust and scratch removal, the 10 plug-ins look like a useful bunch for novice and heavy Photoshoppers alike. For those of you who are knee-deep in Photoshop, let us know your favorite plug-ins in the comments or at tips at lifehacker.com. 10 Free Plug-ins to Enhance Photoshop [ExtremeTech]