I am the original author. The question came about as I have been removing the rear suspension on a 10 year old vehicle (get your friends to persuade you to never do this if you start thinking about it ;-)
The bolts were mostly seized and on the forums I frequent the recommendations were for Kroil Oil - which is not available where I live. Further googling/forum-scanning produced a variety of names and I eventually bought something, which seems to have had very limited effect making any nuts easier to remove, even after multiple applications.
So this is how the question came about.
The primary concern with the question seems to be that it is a 'list' question, so:
I'm happy to maintain it - I doubt that the products will change very frequently. But of course there is no 'right' answer - my only feeling at present is that Kroil Oil seems to be much more highly regarded than other products.
Maybe the question can be phrased differently? But I'm OK to have it closed - I just wanted to have a source that I could refer to and make public rather than just a 'I used it and it seemed OK' experience.