had robo form but trial has finished lol.any other free ones

If you're using firefox, apparently Google Toolbar can do it.
I use Lastpass, works in Firefox and Google Chrome. It's pretty cool, it auto-logs me into all the sites so I don't have to remember the passwords. I can then select Auto Fill and fill out a form, though I sometimes have to tweak it a bit.

I use my free version of roboform - not sure if it was a trial or not but has been working for years (and is free though I never upgrade it as scared they will take it away from me ) - It fills in forms but also lets you save up to 10 username and password entries - but actually you can store hundreds and get them out again when you need them you just need to right click on it

haven't tried anyother ones but I've heard google has one too

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but my trial has run out...it wont work anymore...the google toolbar one I dont find that great maybe I should have a play with it.