GimpFX Foundry | free scripts to expand GIMP

"This set contains different scripts for the creation of effects such as the old picture, lomography, image stylization, creation of all possible meshes and frames for pictures. It also contains scripts that significantly extend GIMP options when working with layers.
The set includes a huge number of scripts for work with image color; there are the scripts for total picture editing, creation of inner shadow, picture sphere and many other effects." [1]
(Link)

Geeqie | free image management software

"Geeqie is an image viewer that makes navigation of images easy. Images can be viewed full screen, and a slide show function allows automatic changing of the displayed image.
Geeqie is an image manager, with complete copy, move, rename, and delete functions available at the press of a button. Find the right image with the search feature. Image collectors can free up space with a function that finds duplicate images.
The one thing Geeqie is not, and never will be, is an image editor. However, Geeqie paired with an image editor, such as the Gimp, can be a very powerful combination."

(Link)

Pencil | open source animation and drawing software

Update:
@ibeardslee has pointed me to a forked, updated version of this software called Pencil2D, which appears to be a better option than the link I give below.
(Link)
"Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.

Pencil is not intended to mimick web-oriented vector-based animation software such as Flash. Its main purpose is to make traditional animation. Neither does it try to rival commercial software targetting the professional animation sector. Pencil is intended to be a simple programme enabling anyone to make 2D animation."
(Link)

Pinta | open source paint program

Pinta is a free, open source drawing/editing program modeled after Paint.NET. Its goal is to provide users with a simple yet powerful way to draw and manipulate images on Linux, Mac, and Windows.

(Link)

UFRaw | raw image editor

"UFRaw (which stands for Unidentified Flying Raw) is an application which can read and manipulate photographs in raw image formats, as created by many digital cameras. UFRaw used to be available both as a stand-alone program and as a GIMP plugin. However, since UFRaw-0.19, the GIMP plugin is no longer officially supported. As a stand-alone program, UFRaw can be invoked with a graphical interface, or as a command line batch processing utility.[1] UFRaw reads raw images, using dcraw as a back end, and supports color management via LittleCMS, allowing the user to apply input, output, and display color profiles (see also Linux color management). Thanks to dcraw's versatility, UFRaw supports nearly all of the numerous raw image formats used by digital camera manufacturers." [1]
(Link)

Inkscape | Vector Graphic Editor

"An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. We also aim to maintain a thriving user and developer community by using open, community-oriented development." (Link)

Graphics App ‘Pinta’ Updates, Brings Improved Tools, Layer Blending

Graphics App ‘Pinta’ Updates, Brings Improved Tools, Layer Blending:
A new release of graphics app Pinta has been made available for download.

Version 1.4 of the simple drawing tool sees a number of new features and improvements made, along with fixes for various bug and performance issues.



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Sculpture and Sine Waves

This is one of the most beautiful things I've seen in a long time:
"Reuben Margolin is a kinetic sculptor, crafting beautiful pieces that move in the pattern of raindrops falling and waves combining. Take nine minutes and be mesmerized by his meditative art -- inspired in equal parts by math and nature. "

EDvent Calendar: Day 4 (Google Streetview)

Have some fun courtesy of Google Streetview. Explore the ruins of Pompeii:
View Larger Map
...or take a stroll through the Colosseum:

View Larger Map
 ...while Google Art Project takes the power of Streetview to the world's best art museums:

Have fun!!

Open Source Physics: Tracker

I discovered this neat tool when learning about the physics of Angry Birds. Not only does Tracker identify and track objects frame-by-frame through a video, it also records and graphs this data for you. It comes with quite a few experiments installed and, in the hands of a good Physics teacher, would form the centre of a very interactive unit on motion and movement. I can imagine students the world around grabbing their cellphones to record video of all manner of objects 'bouncing'. Hmmm. Does my glass of chocolate milk fall at the same rate as a bowl of noodles?
It's an easy-to-use tool that allows students to become better askers of questions and designers of experiments instead of becoming better memorisers of someone else's data.

World Wind: Open Source Google Earth?

World Wind is by no means as full-featured as Google Earth, but if you just want to play Atlas and spin the world around, it's a good option. To install under Linux, look for worldwind in the software channels, but the java version of the software runs on any platform. Best thing about it is that the software is open source and the imagery is not owned and copyrighted by [insert giant corporation here]. There are some nice Java webstart demos here too: http://worldwind.arc.nasa.gov/java/demos/ showing things like loading .kml files, mapping elevations, annotations, geo-mapped photos, earthquake information etc.

Digikam: photo management made easy

I'm a big fan of Picasa. My only quibble with it is that it's not open and is another way for Google to own your ass (or at least all your embarrassing photos). For quite a while I've been looking for a good photo management tool that has powerful batch processing support and I've certainly found one: digikam.

There is quite a list of open source, linux-friendly photo organisers: F-spot, Shotwell etc. but most of them have either no batch processing support or very limited support. Digikam is different and will probably satisfy all of your batch and manage dreams.

It does what it says on the box:

• import pictures
• organize your collection
• view items
• edit and enhance
• create (slideshows, calendar, print, ...)
• share your creations (using social web services, email, your own web gallery, ...)

Yo Frankie!

One of the most high-powered, full-featured open source applications is Blender 3D. It's an incredibly powerful 3D modelling application that has been used to make short films like Big Buck Bunny and Elephant's Dream. So what do all those 3D characters do after their film careers end? They get jobs in computer gaming. Using all of the models and landscapes from Big Buck Bunny, the blender community has created Yo Frankie!, a 3D game with very impressive graphics, that is free for anyone to download and play.

Phatch

If you've ever tried to find the batch processing features in The Gimp, you'll probably have worked out that they don't exist. Phatch might be of use for you if you want to edit more than one image at a time. It's a photo batch processing application that could save you quite a bit of time. It includes:

• resize
• rotate
• rounded corners
• shadows
• watermark
• drag & drop droplet
• colour mode
• dpi change
• rename

Gimp is great but I wish they'd change the name

Manipulated graphic images are so ubiquitous these days. Photoshop has played such a role in popularising this kind of artform that it has even managed to become synonymous with it. At ASHS we wanted our students to learn how to create these kinds of images, but we didn't want to pay tens of thousands of dollars, and nor did we want to only allow a privileged few to develop these skills. Enter GIMP. Gimp can do just about everything Photoshop can do: resizing and cropping photos, altering colors, combining multiple images, removing unwanted image components, and converting between different image formats, but it's open source and it's free.
So this is GIMP: great App; pity about the name: