Digit - SMS bot that monitors your bank account & saves you money
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Quicken - Stay in control of your monthly cash flows, budgets, and expenditures. Quicken provides a navigable interface where you can organize your debit, credit, and savings, and build good habits accordingly.
Geary - Geary is an email application built for GNOME 3.
Penny - Penny is a personal finance app that takes the pain out of keeping track of your finances.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.