There are 2 repositories under free-sms-sender topic.
Send SMS anonymously, with personalized text. Programmed by WhBeatZ
Send upto 100 free SMS within 10 seconds in India daily, unofficial API.
way2sms php api
Free OTP and watsapp campaign service so that you don't have to burn cash on OTP delivery and Watsapp Political or Ads Campaign , saving huge money by sending the one time password (OTP) and ads on watsapp providing good experience to users and target audiences with almost no delay and without worrying about low balances.
This repository contains the open source Java client for BSG's REST API. SMS, Viber and HLR.