QuarkXPress is the world's most widely used and advanced publishing software for all kinds of publishers. Its achievements in terms of print design almost the same as PhotoShop's in the field of graphic design. BTW, it has 30 years of history.
Alien Skin Software's BlowUp is a ultra-high-quality and pretty handy nondestructive image zooming tool released as Adobe Photoshop/Lightroom's filter plugin and standalone application. Its powerful features even leave many similar software (such as BenVista PhotoZoom Pro, Reshade Image Enlarger, Inpixio Photo Maximizer Pro...) in the dust!
First of all, ComicStudio (discontinued) - Manga Production Software, IllustStudio (discontinued) - Illustration Production Software and CLIP STUDIO PAINT are all products of CELSYS company from Japan. CLIP STUDIO PAINT (generally called CSP for short) is a newly released standard drawing tool for illustrations and comics as CS and IS's successor.
onOne Software's Perfect Layers is a professional PSD (Photoshop proprietary) bitmap format file managing/editing application from Germany. It comes with a variety of special effects library, with which you can easily edit each layer of PSD file and modulate all kinds of special effects for them in real-time.
AlienSkin Snap Art is a well-known filter application specially designed for replacing the heavy hand painted work. It is capable of quickly and intelligently converting digital photos to a variety of hand-drawn styles with artistic feeling and lifelikeness, so as to avoid that many complex and repetitive manual work. Also, it is much more effective than action and brush features in Photoshop.