GIMP Plugin Registry

This plugin will create a stroke with a taper, or in other words, a stroke with a start width and an end width, rather than just a constant width. There is an existing plugin that does the same, but this one is a bit faster (although still slow), and has a lot more options.

Settings include start width, end width, exponent (how rapidly the line width changes from start to end), tolerance (there is a inverse relation between speed and accuracy), as well as nearly all the line styles available with the regular GIMP stroke function (e.g. cap/join style).

This plugin will take a set of points (specified with the Path tool) from which it will generate a Voronoi diagram in the form of a new path. There is the option to preserve the original points as a separate path, and a hack is used to ensure these original points can be stroked (assuming a round or square cap style). The algorithm used is described here:

http://en.wikipedia.org/wiki/Fortune%27s_algorithm

This plugin creates a new entry in the Paths dialog right-click menu.

Easily map colours from a source colour to a target colour. Very effective for matching skin tones across images or between people.

Relatively quick (but not earth shattering). It doesn't work with grayscale or indexed images. Has preview, works with selections and layers, etc. Very, easy to use, and quite useful for portraits or recolouring graphics.

Radical Image Optimization Tool (RIOT for short) is a free image optimizer that will let you to visually adjust compression parameters while keeping minimum filesize.

It uses with a side by side (dual view) or single view interface to compare the original with the optimized image in real time and instantly see the resulting file size.