As the effective standard of digital image processing and editing industry - Adobe Photoshop CC (short for Adobe Photoshop Creative Cloud) provides many new features along with more efficient performance (previously only the Adobe Photoshop Extended can provide these tools).
Google Nik Collection is a powerful and professional plug-in set for photo post-processing, composed of 7 image processing plug-ins for different purposes. The plug-in suite is suitable for Adobe Photoshop, Adobe Lightroom or Apple Aperture (replaced by Apple Photos). With it, we can quickly complete many professional photo editing effects with ease.
Paint.NET is an image and photo processing software, it was developed and maintained by Rick Brewster when he was a Washington State University student, written in C# (C Sharp programming language), and was provided the project guidance from Microsoft later for locating in one early MS Paint free alternatives.