Apps to Smooth lines

ibis Paint X is a popular and versatile drawing and painting application designed for mobile platforms, offering a robust suite of tools for digital artists. It boasts a massive library of brushes, filters, blending modes, and supports layers, pen pressure, and recording timelapses.

Serif PhotoPlus is a powerful image editing software for Windows, offering a comprehensive suite of tools for photo manipulation, retouching, and creative effects. It was known for its user-friendly interface and robust feature set, catering to both beginners and experienced photographers.

Microsoft Expression Design was a professional graphic design tool for creating vector and raster images, primarily for web use. It offered a range of design and illustration features, including vector drawing, image editing, and support for various file formats.

FireAlpaca is a free digital painting and drawing software available for both Windows and Mac. Designed with simplicity in mind, it offers core drawing tools and features like layers, brushes, and tablet support, making it accessible for beginners learning digital art.

Autodesk SketchBook is a powerful yet intuitive digital drawing and painting application designed for artists, designers, and creative professionals. It offers a comprehensive suite of tools to create stunning artwork on various platforms, focusing on a natural drawing experience.

Sumo Paint is a versatile, browser-based image editor and painting application. It offers a robust set of tools for both photo manipulation and digital art creation, accessible directly through your web browser without requiring installation.