Simply Plural is a website and app that allows you to add system members, manage them, and show who's fronting. Simply Plural allows you to add friends and make them able to see who's fronting with the app or website based on privacy bucekts, so if you don't want them to know about a certain alter, you're able to have them not see them. Simply Plural is a bit hard to use at first so I always recommend a tutorial. I'll link one that I've made below :]
Simply Plural TutorialAlso, here is Simply Plural for those interested