Legally there is no such thing as abandonware. Due to the fact that these
sites are illegal I'm afraid I not prepared to help you find them, sorry.
Besides if I did give the URL's out here, how long do you think the sites
would stay up and running?
I sympathise with the fact that there are some required/useful programs
which are no longer made available, but I really don't want to face a fine
or whatever the penalty is for making them available.
For what its worth I do think that companies should make software freeware
when they no longer want to support it, some of course do this.