Comment by cdcfa78156ae5

This is why Richard Stallman calls SaaS "Service as a Software Substitute" and recommends running your own programs on your own computers: https://www.gnu.org/philosophy/who-does-that-server-really-s...

If you are using any Unix derivative there are still Free Software applications from the 1980s (or 1970s if you run BSD) that you are running every day without any problems, whether you realize it or not.

Consider doing your financial modeling with a Free Software program like Gnumeric: http://gnumeric.org/