I mentioned in Tuesday's post a good piece of free mathematical software available online. I think that for most economic analysis and presentations in business and academia, it would be sufficient to work with the following bits of free software:
Open Office available here.
Gretl available here.
Maxima available here.
For presentation and common empirical analysis, Open Office is enough. Gretl allows for more complex empirical or academic analysis. Maxima is helpful if theoretical analysis is required too.