Buzzfeed has a collection of 23 powerful cartoons, I've re-posted a few.
Dutch cartoonist Ruben L. Oppenheimer:
Indian cartoonist Neelabh Banerjee:
Bernardo Erlich from Argentina:
|"The world has become so serious that humor is a risky business"|
Plantu from France:
|"My heart is with Charlie Hebdo"|
And from the Buzzfeed folk: