LazLock is a lightweight, portable password manager that runs on both Windows and GNU/Linux.
It doesn't need to be installed on your computer, so can be run from a USB stick. Carry both the Windows and the Linux versions with you and you'll be able to access your passwords from any PC.
It also has an option to create strong, random passwords for all of the websites that you visit, you only need to remember one password to unlock them all.
Your data is strongly protected with 128 bit AES encryption.