Retouch Pro for Adobe Photoshop + Mega Bundle can be downloaded for free in its entirety as a standalone offline installation. The most sophisticated plugin for simple image retouching is this one.
Retouch Pro for Adobe Photoshop 3.0.1 Download
To help you reach perfection in portrait retouching, the free download Imagenomic Portraiture plugin for Adobe Photoshop and Lightroom removes the tiresome manual labor of selective masking and pixel-by-pixel treatments.
Imagenomic Portraiture 4.1.2 for Photoshop / Lightroom Download
2020 AKVIS Plugins Bundle Free Download These plug-ins for Adobe Photoshop are applications that work with your current software to increase its functionality and provide new features. AKVIS creates plugins for software used in image and video editing.
AKVIS Plugins Bundle 2020.11 for Photoshop Download