As most will know Lemmings were very popular when it came out. Due to this, they inevitably appeared in a whole lot of shifty software and demos etc. In this thread I will post any I come across!
First off we have the true names of skills in a cheat menu of a cracked version of the Atari ST port:

(Note: Saying yes to both of the confirmation options causes my emulator to completely crash and close)
Also on the atari ST is a large series of pirate multi-disks which are themed on lemmings, I still haven't gone through them all but these are the best things from them I've seen yet:

And finally for now, a strange demo on the amstrad CPC, hidden under a spoiler for some large swears
I'll post more when I find it

(For those interested I also run
a blog that specialises in this kind of thing, because I love it)