SMS Merge Free

This is the free version which limits the maximum recipients to 5. The full version has no limits:
https://play.google.com/store/apps/details?id=com.tompierce.smsmerge

SMS Merge lets you merge contact information into your text messages. By using a placeholder such as #firstname, you can send the same message to many contacts, and each one will be personalized to the individual.

Currently supports the following data from your contact's details:
#firstname - first/given name
#lastname - last/family name
#fullname - contacts full name
#nickname - contacts nickname

To preview a message before sending, simply tap a name in the Recipients list.

Please send any comments/suggestions to tom.pierce.developer@gmail.com
I'm keen to get user feedback to prioritize adding new features.

Currently planned for future releases:
- Sent items list
- Delivery reports
- Additional contact information