Codacy est particulièrement génial.

Mais avez-vous envisagé ces alternatives open source ?

Elles sont gratuites, auto-hébergeables et communautaires.

Vérifiez par vous-même : SonarQube .

SonarQube aussi

Code quality Continuous Inspection
★ 9.5K CI Code quality License: LGPL-3.0
SonarQube provides the capability to not only show the health of an application but also to highlight issues newly introduced. With a Quality Gate in place, you can achieve Clean Code and therefore improve code quality systematically.

https://www.youtube.com/watch?v=xeTwG9XFFTE