Thre is not really any where that you can read on how to revoke steem applications.

I am making this handy list to help with that. If you know of other apps that need to be on this list, please let me know

busy.org
dmania.app
dtube
Esteem Mobile App
Fundition
minnowbooster
steem-plus-app
streemian
utopian.app

The basic method to do this is via steemconnect: https:/v2.steemconnect.com/revoke/appnamehere
If you want to see what apps you have enable to use your posting key you can go to : https://v2.steemconnect.com/apps/authorized

Thanks,
Michael Garcia a.k.a. @TheCrazyGM