Here are some "selling points" of KeePass. To get a first impression, you can also have a look at some of the screenshots. If you don't know which edition to choose (1.x or 2.x), have a look at the editions comparison page.

Items prefixed with [1.x] only apply to KeePass 1.x, [2.x] only applies to KeePass 2.x.

• Strong Security
• Multiple User Keys
• Portable and No Installation Required, Accessibility
• 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!