KeePass Password Safe is a free open source password manager, which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key file. So you only have to remember one single master password or select the key file to unlock the whole database. The databases are encrypted using the best and most secure encryption algorithms currently known (AES and Twofish). For more information, see the features page.

Is it really free?
Yes, KeePass is really free, and more than that: it is open source (OSI certified). You can have a look at its full source and check whether the encryption algorithms are implemented correctly.

KeePass Features
* Strong Security
* Multiple User Keys
* Portable and No Installation Required
* Export To TXT, HTML, XML and CSV Files
* Import From Many File Formats
* Easy Database Transfer
* Support of Password Groups
* Time Fields and Entry Attachments
* Auto-Type, Global Auto-Type Hot Key and Drag&Drop
* Intuitive and Secure Clipboard Handling
* Searching and Sorting
* Multi-Language Support
* Strong Random Password Generator
* Plugin Architecture
* Open Source!

Strong Security
* KeePass supports the Advanced Encryption Standard (AES, Rijndael) and the Twofish algorithms to encrypt its password databases.
* Both of these ciphers are regarded as very secure by the cryptography community. Banks are using these algorithms for example, too.
* Even if you would use all computers in the world to attack one database, decrypting it would take longer than the age of the universe.
* Even quantum computers won't help that much. The algorithms are symmetric so its complexity would be reduced a bit, anyway, the sun will go nova before you have decrypted the database.
* The complete database is encrypted, not only the password fields. So your usernames, notes, etc. are protected, too.
* SHA-256 is used as password hash. SHA-256 is a 256-bit cryptographically secure one-way hash function. Your master password is hashed using this algorithm and its output is used as key for the encryption algorithms.
* In contrast to many other hashing algorithms, no attacks are known yet against SHA-256.
* Protection against dictionary and guessing attacks: by transforming the final master key very often, dictionary and guessing attacks can be made harder.
* In-Memory Passwords Protection: Your passwords are encrypted while KeePass is running, so even when the operating system caches the KeePass process to disk, this wouldn't reveal your passwords anyway.
* [2.x] Protected In-Memory Streams: When loading the inner XML format, passwords are encrypted using a session key.
* Security-Enhanced Password Edit Controls: KeePass is the first password manager that features security-enhanced password edit controls. None of the available password edit control spies work against these controls. The passwords entered in those controls aren't even visible in the process memory of KeePass.
* Also see the security information page.

Installation
Download this package and unpack it to your favorite location (USB stick, ...). KeePass runs without any additional installation and won't store any settings outside the application directory.

Supported operating systems:
Windows 98 / 98SE / ME / 2000 / XP / 2003 / Vista / 7 / 8, each 32-bit and 64-bit, Mono (Linux, Mac OS X, BSD, ...).

Prerequisites:
Microsoft .NET Framework > 2.0 (preinstalled on Windows Vista) or Mono 2.6.

Changes from 2.25 to 2.26: 2014-04-13
- New Features:
* Added option to show a confirmation dialog when moving entries/groups to the recycle bin.
* Auto-Type: added workaround for applications with broken time-dependent message processing.
* Auto-Type: added workaround for PuTTY's default Ctrl+Alt behavior (which differs from Windows' behavior).
* Auto-Type: added configuration option to specify the default delay between two keypresses.
* Added optional sequence comments column in the auto-type entry selection dialog (in this column, only {C:...} comments in the sequence are displayed; if a comment starts with '!', only this comment is shown).
* If the option 'Automatically search key files' is activated, all drives are now scanned in parallel and any key files are added asynchronously (this avoids issues caused by slow network drives).
* Added trigger action 'Show entries by tag'.
* {OPERA} placeholder: updated detection code to also support the latest versions of Opera.
* {T-CONV:...} placeholder: added 'Uri' type (for converting the string to its URI-escaped representation).
* Synchronization functions are now available for remote databases, too.
* Enhanced RoboForm importer to additionally support the new file format.
* Summary lists are now also available in delete confirmation dialogs on Unix-like systems and Windows XP and earlier.
* Added workaround for Mono Process StdIn BOM bug.
* KPScript: added 'refx-All' option (matches all entries).
* KPScript: added optional parameters 'setx-Expires' and 'setx-ExpiryTime' for the 'EditEntry' command.
- Improvements / Changes:
* Improved database tab selection after closing an inactive database.
* New just-in-time MRU files list.
* Improved selection of entries created by the password generator.
* The internal text editor now determines the newline sequence that the data is using the most when opening it, and converts all newline sequences to the initial sequence when saving the data.
* Improved realization of the {CLEARFIELD} command (now using Bksp instead of Del, in order to avoid Ctrl+Alt+Del issues on newer Windows systems).
* The note that deleting a group will also delete all subgroups and entries within this group is now only displayed if the group is not empty.
* Improved GUI thread safety of the update check dialog.
* Improved HTML generation.
* Improved version formatting.
* On Unix-like systems, window state automations are now disabled during initial auto-type target window switches.
* On Unix-like systems, the button to choose a password font is disabled now (because this is unsupported due to Mono bug 5795).
* Various files (e.g. 'History.txt') are now encoded using UTF-8.
* Improved build system.
* Various code optimizations.
* Minor other improvements.
- Bugfixes:
* In the 'Configure Columns' dialog, the activation states of plugin-provided columns are now preset correctly.