In my prior descriptions, I had some not too nice words for the GIMP. For those that have 
never heard of it, The Gimp is a free art program, generally regarded as the closest thing to Photoshop that the OpenSource world has to offer. In my prior use, I found the GIMP pretty much terrible and I resorted to using the much less powerful but more more enjoyable Paint.Net.
That said, I started running into limitations almost instantly, so I gave the GIMP another shot, and colour me impressed! I managed to import multiple screenshots, into a single layer, resize and crop them all in one action, optimize and export for animated GIF in minutes. This was an eye opening experience!
That said, I then spent 5 minutes and had to resort to Googling to figure out how to draw a line… so, yeah, the UI still needs a bit of work! Fortunately that is what they are working on now. All told though, I really shouldn’t have had such a negative view of this app, when using it to actually get something done, as opposed to just messing around in it, it came through brilliantly.