Easeit

Easeit is a Blender addon to apply easing presets for your timeline/dope sheet and graph editor keyframes.

Steps:

1. Create at least two keyframes (or open a scene with at least two keyframes) with different values from each other.
2. Open the sidebar on the dope sheet or the graph editor.
3. Go to the Easeit tab.
4. With the keyframes still selected, click on any of the available presets to apply them to the selection.

That's it! You have many options to choose from. Have fun!

Let me know of any bug or error by opening an issue at github. You are free to open a PR or suggest features too, but I don't make any promises of implementing them. I do have ideas for future versions, but I'll have very little time in the upcoming months, so those will have to wait.