Flowchart is most frequently used as I am a programmer (though not as my career). If using Microsoft Office, it provides drawing tool for preparing flowchart. It is easily to be used. Since my primary office suite is LibreOffice, I frankly admit that drawing tool in LibreOffice is not satisfying to complete my work. This is because, preparing the graph or diagram, using a paper layout is not convenient, because I have to make sure that my flowchart is within the paper.