It will probably be a long while before Evernote disappears if it does at all. And it will also be some time before any open source software will be able to fill in those extra large shoes. Some alternatives, like Turtl, just stick to the bare minimum while others like Standard Notes try to find sustainability by offering features as part of a paid subscription. Joplin takes a rather different approach. In order to provide a note-taking interface and experience that matches or even surpasses Evernote, it mostly offloads one functionality to others: synchronization.