@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 No I'm not saying that. I dont know if its FOSS. It sounded like you were saying it wasnt FOSS and wanted a FOSS alternative. If its already FOSS is there a reason youa re looking for a fork?