MoneyManager Ex

MoneyManager Ex is an open source expense tracking tool available on Windows, Mac, and Linux, with a long development history dating back nearly two decades. It handles multi-currency transactions, supports recurring expenses, and lets you sync data across devices through cloud storage services like Dropbox or your own server. Because it's open source, you can inspect the code and modify it yourself if you have the technical skills.

This tool works well for technical users who prefer open source software and want freedom from subscription fees. It's particularly useful for people managing money across multiple currencies or running on less common operating systems like Linux, where commercial budgeting apps often aren't available.