I'm sure there are, but I wouldn't dare to install anything like that on my phone. Any type of open-source software on a phone can often request access to cameras, phone, contacts, etc., and while I have an android and can customize that, I still get leary over an application that may even try.
I'm also not very good with smartphones so I could just have tin foil over my head.
I don't use most browser extensions for similar reasons, I'm always concerned about open source coding and freeware.
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