There are 5 people. 3 of them are lying, 2 are telling the truth.
A says that D is lying.
B says that C is lying.
C says that A is telling the truth.
D says that E is lying.
E says that B is lying.
Who's telling the truth and who's lying?
I would have said Gimp (you find it online for free), but since you want to pay for a program that serves exactly the same purpose, I don't really have a recommendation except maybe Photoshop or Paint Shop Pro.