KeeWeb

KeeWeb is a free and open-source password manager compatible with KeePass, available as a web version and desktop apps. The underlying file format is KDBX (KeePass database file). KeeWeb was praised by Ghacks Technology News in 2016 as "brand-new" fixing the "shortcoming of a web-based version" of KeePass, and by Tech Advisor in 2020 as "well-designed cross-platform password manager".
It is written in JavaScript and makes use of WebCrypto and WebAssembly to work with password files directly in browser, without uploading them to a server. It can synchronize files with popular file hosting services, such as Dropbox, Google Drive or OneDrive.
The same JavaScript code is also packaged as desktop apps built with Electron. The desktop version adds some features not available on web:
KeeWeb can also be deployed as a standalone server, or installed as a Nextcloud app.