Digitalcoin (DGC) - Has built in protection for 51% and approaching its 1 year anniversary. Also has great community support
I have an honest, genuine question for you: What exactly does Digitalcoin provide to prevent a 51% attack?
Every X # of blocks there is a "Checkpoint" block that resets the chain back to a set point making it hard to fork. I don't personally understand exactly how it works, but I do know that it seems to have worked. I can ask baritus to explain it the next time I see him and I can pm it to you if you'd like me to.