Well it's not entirely free.. but if you use Roboform in any version (PC or Portable) then Roboform Online is Free to use, and they have an android plugin that works with the built in browser via a Bookmarklet.
I don't know of any FREE good password apps, but at least Roboform isn't a yearly fee.. just a onetime cost for the initial software (which you can use on your PC and sync up seemlessly).
I personally use Roboform Portable, and have it autosync to roboform online.. I keep the flash drive on my keys so no matter where I am my passwords are up to date. At work I Plug it in and use it, then take it home easily.. no installation on the client which is great for work PCs.