Dropsync - DropSync is a super fast and flexible folder synchronization tool.
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.
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.
Easy Contacts Backup & Restore - Easy Contacts Backup & Restore is an app by Future Tech that comes up with features to help you in saving your phone numbers in a backup file to restore the file in case of data deletion to get your deleted contacts back.
Picflow - Online gallery and proofing platform for creative professionals.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.