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.

Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

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.