What are some good modification apps?

[MaxB2028]

What are some good apps? I use for example Galaxy MaxHz. Any other modifications apps?

[CEParsons]

Good Lock is Samsung's official suite of customization apps.
https://apps.samsung.com/appquery/appDetail.as?appId=com.samsung.android.goodlock

Icon Pack Studio is one of the most robust icon personalization tools I have found and can be used in conjunction with Theme Park.
https://play.google.com/store/apps/details?id=ginlemon.iconpackstudio

KWGT provides virtually endless widget personalization options.
https://play.google.com/store/apps/details?id=org.kustom.widget

KWLP provides even more interesting options.
https://play.google.com/store/apps/details?id=org.kustom.wallpaper