Creation Kit is the tool to compile
.pex. But CK lack performances, and a good User experience/User interface.
This is why PCA is born.
Development of PCA started in 2018. It is created by Lyrod, who has many usernames: Wk (mainly), Kiyozz (Github), and WushuLate (Nexus mods username).
PCA first focus is user experience, and user interface.
PCA helps the mod developer with many great features.