Anything can be mined with a low CPU as long as not many people are mining it. The difficulty retarget will take care of it.
But if you want a public coin that you can still mine with a CPU, then one of your best bet for an algo is scrypt-jane with a high n-factor (17 or higher) at which point GPUs are roughly as fast as CPUs.
So are there any coins that fit this category? If so what's the name of those coins?