I didn't know about Tabula and i've given a try at the instant. Apparently it only extracts tables and ignores everything around. This might be good in some cases but it is a problem if you want to extract a form, a whole textbook, your bank statements or anything. Also, I noticed that Tabula has some slight troubles when columns are not drawn in the table. But overall it is a good tool for extracting only tables, that's true.