There are many web-based apps for designing + editing images and, day-by-day, they are becoming a serious alternative to any desktop image editing softwares.

On the other hand, it is hard to find "animated GIF support" in any of them and creating animated GIFs without a desktop app can be a pain.

Online Animated GIF Creator

MotherEffingAnimatedGIF is a very simple-yet-functional and open source web application for quickly creating such images online.

You just drag 'n' drop any number of images to the app, re-order or rotate them, set the image size + quality and the delay between each frame.

After that, it is possible to preview the animated GIF and download the output.

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