2D

GUI tool, to view intensity profile dynamically as the position of ROI is changed by mouse-dragging a ROI. In more recent ImageJ, the native plot-profile window is equipped with "Live" mode, so this plugin function became a part of ImageJ.

This plugin is a good scripting example using Clojure (see source code).

This is an icy package that encapsulates tools to design and implement parametric active contours. The package provides fast 2D and 3D filters for image preprocessing, and a framework to create and evolve snakes defined by a set of control points.