Krita (formerly called KImageShop, Krayon) is a free, open-source and cross-platform digital painting software developed by Krita Foundation (part of the KDE Community) from Sweden. It is fully functional, capable of the entire painting process from drafting, lining, coloring to post-adjustment; can draw concept sketch, illustration, cartoon, animation, scene and 3D mapping; supports digital board, pressure sensing, anti-shake, layers, filters, color management, and other functions.

Digital Camera Enhance (DCEnhance/DCEnhancer for short, AKA: Free Digital Camera Enhancer) is a free and tiny image processing automation program developed by MediaChance (written by R. Voska) from Canada. It's mainly used to manually or automatically bring blurry photos taken with a digital camera into focus with one click! Therefore, it is very suitable for processing photos taken when the light is not good enough (indoor, with shadow, etc.), and especially good at making cool portraits and close-ups.

No matter how good a camera or the photographer's technology is, the photographing effect can't compare with what the human eye can see (they are not in the same order of magnitude). As a result, almost all digital photos need to first go through the post-processing of some kind of image processing software before being published finally. However, the known photo processing applications mostly rely on a pile of filters to realize a rapid beautification or repair to photos. Their common fault is - simplex function, not smart enough, requires users to have the relevant experience and skill, and the operation is tedious and time-consuming.

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.