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.
Mint - Free personal finance software to assist you to manage your money, financial planning, and budget planning tools. Achieve your financial goals with Mint.
The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.