GnuCash is personal and small-business financial-accounting software, freely licensed under the GNU GPL and available for GNU/Linux, BSD, Solaris, Mac OS X and Microsoft Windows.

Money Manager Ex is a free, open-source, cross-platform, easy-to-use personal finance software. It primarily helps organize one's finances and keeps track of where, when and how the money goes. It is also a great tool to get a bird's eye view of your financial worth.

Gain Total Control of Your Money.

Actual is an personal finance tracker with a powerful budgeting system. Only budget money that you have and see exactly how much you're saving each month. Track all your accounts in one place.

Recurring Expense Tracker is a Material You recurring expense tracker, allowing you to keep track of your monthly spending. As its name suggests, it focuses on reccurring expenses such as rent, insurances, subscriptions etc.

MoneyWallet is an Android application that let you track your expenses. You can organize your data using custom categories, events, places and people tags. The best alternative to others apps, free and open source.

Paisa is a Personal finance manager. It builds on top of the Ledger double entry accounting tool.

GreenStash is a simple FOSS android app to help you plan and manage your savings goals easily and establish the habit of saving money.

Expenzio is a minimal expense tracker app that helps you manage your expenses with ease. It categorizes your expenses so you can look into your spending trends, and it makes it easier to search your transactions by query, account, or category.

Oinkoin Money Manager makes managing personal finances easy and secure. It is light and easy to use. You need just few taps to keep track of your expenses. Simplicity and Security are our two main drivers: Oinkoin is an offline and ad-free app.

Turn your receipts into spending insights. Track and analyze your spending with automatic line item categorization and detailed insights.

Skrooge allows you to manage your personal finances, powered by KDE 4.x. Thanks to its many features, it is one of the most powerful way to enter, follow, and analyze your expenses.