Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Although the idea of using an application to manage your personal finances makes a lot of sense, not all of us have the time and patience to learn all the intricacies of tools like GnuCash or Money Manager Ex. If that sounds like you, try Buddi, probably the easiest to use personal finance manager out there.
Written in Java, Buddi runs on most platforms that can run the Java Runtime Environment. If you are running Debian or Ubuntu, you can download and install it from a .deb package; otherwise you can opt for a plain .jar file that will run on pretty much any Linux distro.
To launch Buddi, use the java -jar Buddi-x.x.x.x.jar command. When the application is up and running, it immediately prompts you to create a new data file. There are two things you should keep in mind here. First, it's a good idea to place the data file in a separate directory, so when Buddi generates reports and graphs they are neatly stored in the same location as the main file. More importantly, you should encrypt your data file to make sure that nobody else can access your financial information.