Free plug-ins for acidic noizes?

[Ian R]

Like the title says really... I'm after a free (if possible) plug-in that will make bouncy squelchy acid sounds!
I've had a browse on here but couldn't see any, but I'm quite new to this production malarky so I might of misseed one :)

[loopdon]

Something to get you started, unsure if it saves it`s settings etc. but pretty sweet sound (i think there were less limited betas but i couldn`t (yet) locate them):

http://www.blackoutaudio.co.uk/forum/showthread.php?t=48263&highlight=creakbox

[nihilist]

not a free one but $20 isnt much

http://www.muon-software.com/html/shop.html