WikiMapper by Patrick McCarthy

WikiMapper creates a historical tree of your Wikipedia browsing so that you can see just exactly how you spontaneously wasted 45 minutes and ended up reading about the history of Agriculture in Uzbekistan.

Once installed, you do not have to do anything special to use WikiMapper. It runs passively in the background and only on the wikipedia.org/wiktionary.org domains. It stores your Wikipedia browsing sessions locally so you can view them later at any time by clicking in the WikiMapper icon in your browser toolbar.

WikiMapper is free and open source software and does not collect any personal information, serve any ads, or transmit any data of any kind to anyone.