Telegram, Mightytext, Facebook Messenger, Viber, ICQ, Xabber, Trillian, Ozeki NG SMS Gateway, Site2SMS, Telegram X, Way2SMS, SMS+, Conversations, Textable, GTalkSMS, NowSMS, biteSMS, Qute Messenger, Cherry SMS, SMGS, FullonSMS, SMS Local Agency, iRealSMS, RemoteSMS Pro, AirText, Esmska are some alternatives to XendApp.