@realcaseyrollins if the app isnt FOSS already then it cant be "forked" at best it might be cloned. So might want to use differnt language when you search and get better results.
There are certainly lots of SMS messaging apps that behave very similarly. I guess it depends on what your looking for.
@realcaseyrollins Have you tried QKSMS? I havent used it so I myself cant comment but it is a popular alternative that I know is open-source
I just figured that since #Android is #FOSS somebody would have forked #Messages and removed some of the googly stuff from it