Knotter is an easy-to-use graphical application for users who want to design interlace patterns (Islamic interlaces or Celtic knots) in a modern and innovative way. The software is open source and freely distributed on all supported operating systems.

Key features include a graphical knot editor, style options, a highly customizable and simple graphical user interface, as well as the ability to export files as bitmap (BMP) or SVG (Scalable Vector Graphics) images, which can be used in a professional graphic software.

Its flexible knot styling includes fine-tunable features, support for multiple outlines and colors, various shapes and transparency. Its simple, yet powerful tools allow you to design patterns with minimum effort.

Another interesting feature is the ability to export designed patterns to various image formats, including PNG, JPEG and TIFF. Knotter is an international application, translated in several languages, including English (U.S. and British), Italian, Czech, and Russian.

Thanks to its powerful plugin architecture, users will be able to easily extend Knotter’s default functionality through plugins, which can be downloaded from the official website or from the community. With these plugins, you can add all sorts of features that will make Knotter your favorite tool for designing interlace patterns.

Looking under the hood of the Knotter project, we can notice that it has been written in the C++ programming language, which means that it is fast and low on resources. Its graphical user interface (GUI) is designed with the cross-platform Qt toolkit.

Knotter is a cross-platform application that has been successfully tested under several mainstream GNU/Linux distributions, as well as on the Microsoft Windows and Mac OS X operating systems. Supported computer platforms include 32 and 64-bit.