There are 2 repositories under sms-spammer topic.
A free to use OTP & Call flooding android application with unlimited sending capability.
Birden Fazla Sms Atarak İstediğiniz Kişiye Şaka Yapabilirsiniz.
A better styled and simpler version of the email bomber program which doesn't compromises in style, functionality or performance
Sms spammer/bomber that uses smtp protocol to launch the attack
Just a fun thing ;)