Keyframe Wingman is a free tool for easing keyframes in Adobe After Effects and it works inside the most widely used free plug-in Animation Composer.
Animation Composer is a huge library of adjustable motion presets and precomps. There is a lot of additional handy features to save you a ton of time. It comes with 100+ free presets and precomps.
You can download the Animation Composer plugin from misterhorse.tv, once installed, go to Window > Animation Composer – Keyframe Wingman to run the tool.