Muvizu - is a free software that makes creating cool 3D animations much simpler than any other tool. Instead of extensive programming or graphic design, Muvizu lets you use an existing library of assets to create an animation. For example, you can use hundreds of pre-existing backgrounds in your animation instead of creating from scratch.
F.lux gradually "warms" the overall color of your display around sunset, which, at least in theory, helps to counter the negative effects your monitor has on your sleep schedule.