Bitrix24 is a free CRM with SMS integration, supporting individual and bulk text messaging. Our free CRM supports all popular SMS sending services (Twilio, Plivo, Lox, etc.), and a free API access makes it possible to use Bitrix24 with any SMS provider. Currently, SMS messages can be sent from Bitrix24 CRM to your clients in over 100 countries.
Bitrix24 offers a number of advantages over regular SMS services. First, you can easily segment your client base and send custom targeted messages to each client based on his or her past purchase history. Second, being an omnichannel CRM, Bitrix24 gives you multiple ways to reach each client via different channels – telephony, SMS, email, Facebook, Instagram or Google. Finally, you can set marketing automation workflows when SMS sending is triggered by a specific event inside the CRM.
Bitrix24 CRM manual is available here.
If you are interested in buying self-hosted editions of Bitrix24, which come with API, CMS and source code, can be easily customized and integrated with other tools, please download a trial version here.