Open Source(GNU GPL) Password Manager program.
-Can generate random passwords.
-Can save password files in encrypted database (Blowfish Encryption)
-Very small in size, only 146 KB executable file.
-No special requirements, just extract and run
-Doesn't write on registry
Link: http://www.pradsprojects.com/subrosa.html
You can download both binary and source code of the project from above link.