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.

HomeBank is a free software. Use it to manage your personal accounts. It is designed to easy to use. Analyse your finances in detail using powerful filtering tools and graphs.

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.

RecurringExpenseTracker 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.

Financial manager, it can help you keep track of expenses, income, budgets and everything in between. It even supports credit cards, shared household accounts and savings accounts.

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.

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.

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

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.

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.

KMyMoney is a cross-platform personal finance manager built on KDE frameworks technologies for your desktop and notebook environment. It enables users to keep careful track of their personal finances by providing a broad array of financial features and tools.