Fossil: A decentralized version control, bug tracking, and wiki software
Original author of Fossil here, with two comments:(1) Fossil was created for the single purpose of supporting SQLite development, a mission at which it has succeeded spectacularly. Fossil is therefore a success story, irregardless of its mind-share relative to Git.  That thousands of other developers also find Fossil useful on their own project is just gravy. I am not concerned that Fossil has not (yet) become the "one true and great DVCS". My intent is to continue personally supporting and maintaining Fossil for at least three more decades.(2) Git people: Please steal ideas and code from Fossil. This is not about winning and losing; it is about providing the best possible tools. Fossil has a number features which are missing from Git but which could be easily added to Git and would enhance the Git-user experience. I'm not talking about the philosophical differences between Fossil and Git (which I recognize that Git is unlikely to ever change) but rather specific UI features such as "fossil all" or "fossil ui" or "fossil undo" or the ability to view the ancestors of check-ins. Fossil is 2-clause BSD, so you do not even have to acknowledge where you stole the code from. Do it for your users, please.