Save contacts - Save contacts app provides features through which users can select the desired data to create the backup in a variety of different formats.

rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.

SIM Contacts Manager - SIM Contacts Manager app offers features that let you insert your sim card to your mobile phone to manage, edit, add, and delete your contacts right at your fingertips.

Share Contacts PRO - Share Contacts PRO app comes up with features to help users in editing a contact from your phonebook to change the name, phone number, address, and other details without much of a stretch.

SMS Backup+ - Backup Android SMS, MMS and call log to Gmail / Gcal / IMAP - jberkel/sms-backup-plus

vCard Export Import(Lite) - vCard Export Import(Lite) app allows you to export your phone numbers in your contact list to the internal storage in vcard, vcf, txt, CSV, and various other file formats.