In my opinion, SQLite has good documentation, and so does the Fossil version control system. (Unfortunately, a lot of modern software lacks documentation, maki

In my opinion, SQLite has good documentation, and so does the Fossil version control system. (Unfortunately, a lot of modern software lacks documentation, making it difficult to use. Do not assume that the user interface is understandable. If you do not include comprehensive documentation, then it will not be understandable.)