Brucey B Slots was known as a good way to get easy NP a while ago, till TNT took down the slots for a while. Once they came back, they had a limit of 250 plays (not sure how it took TNT like a year to add that limit but ok). Still potentially a good moneymaker even with just 250 plays, I made my own autoplayer.
Choose bet amount and number of lines to play
Optionally choose a max amount of spins (up to 250!)
Save login information
Autologin on next use (requires saved login info)
Stats in bottom right corner
Note - This is an old program of mine; there may be bugs now that there weren't before. However, I have thoroughly tested (to the best of my ability) and found that the program is still in working order.