Keyframe Manager, developed by Pixcode, gives After Effects users a dedicated interface for working with keyframes. From its interface you can view, edit, rearrange, search and replace, and copy and paste keyframe data.
The tool covers a range of keyframe operations. You can change any keyframe value, switch easing types, and search and replace any value. Order can be changed visually, keys can be shifted by defined amounts, and values can be copied and pasted. Easing setups can be saved as favorites and applied again later.
Keyframe Manager runs on After Effects 2025, 2024, 2023, 2022, 2021, 2020, and CC 2019, so it fits both current and older project setups. It sits in the Toolfarm library among many animation utilities, and a demo video is available for a closer look at the interface.