Floccus Bookmarks Syncβ β β β β Very flexible, syncs across many different desktop browsers and mobile devices, and for privacy it can run on your own server or encrypted on another cloud service.
KeePass Password Managersβ β β β β KeePassXC, its browser extension, and KeePass2Android are a nice, clean set of apps to manage your passwords on your OWN desktop and mobile devices, auto-fill websites and apps, and sync over your own server or cloud provider.
Wayback Machine Browser Extensionβ β β β βUseful for when you want to make sure the pages youβre reading will still be around in some form in the future, and to easily get at additional context. Checks every page you view against the Wayback Machine, so turn it off when youβre not using it.
Xmarks (Discontinued)β β β β βXmarks was a cross-browser bookmark sync service that I used for a long time to keep Chrome, Firefox, IE, and Safari on multiple computers using the same set of bookmarks. It shut down in 2018.