Excavator is a very lite NVIDIA and AMD mining software developed and signed by NiceHash. It delivers competitive hashrate performance and most importantly it has a 0% fee, unlike other 3rd party miners which generally charge a 1% development fee! Excavator can be run as a standalone miner.
You can read more about Excavator here.
NiceHash QuickMiner is a wrapper software for Excavator. Because the Excavator can get tricky to use for new users, we created another product for end-users called NiceHash QuickMiner, which does all the hard & tricky configuration automatically so you just click a couple of buttons and don't have to worry about too deep technical stuff.
You can find more information about QuickMiner on the QuickMiner GitHub page.