KeePass

KeePass is a free, open-source password manager developed by Dominik Reichl. It stores credentials in an encrypted local database, allowing users to organize entries into groups and subgroups. Each entry typically contains a title, username, password, URL, and notes, and databases can be protected with a master password and an optional key file.

KeePass 2.x uses the KDBX format and protects access with a master key derived from the master password and optional key file. The database is encrypted with AES-256 by default, with support for additional encryption options in different contexts, and secured by a key derivation function to resist brute-force attacks.

Key features include a built-in password generator, auto-type for filling credentials into other applications, attachments, history tracking, and rich metadata. It supports powerful searching, tagging, and group-based organization, and can import from or export to common formats.

Platform and ecosystem: KeePass is primarily Windows-oriented software, but ports and compatible tools exist for Linux and macOS through Mono or native ports. Notable forks and derivatives include KeePassXC, a cross-platform implementation, and KeePassX. Browser integration is provided by extensions such as KeePassHTTP or KeePassXC-Browser for automatic form filling.

Security and usage: Because the database is stored locally by default, users must manage backups and protect the master key. Some users store the database in encrypted cloud storage or use portable versions for secure on-the-go access. Regular backups and strong, unique master passwords are recommended.