I created a opensource software with the name suosuoban. It is an illustrating tool, with ideas coming from this paper <a href="http:&#x2F;&#x2F;www-ui.is.s.u-tokyo.ac.jp&#x2F;~takeo&#x2F;papers&#x2F;watanabe_uist2007_bubble.pdf" rel="nofollow">http:&#x2F;&#x2F;www-ui.is.s.u-tokyo.ac.jp&#x2F;~takeo&#x2F;papers&#x2F;watanabe_uist...</a>. It is in <a href="https:&#x2F;&#x2F;github.com&#x2F;henryscala&#x2F;suosuoban" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;henryscala&#x2F;suosuoban</a>. It is implemented in QT, so it can be run in multiple OS.