of course, there is a lot of popular trading bot available. among them, 3commas,cryptohopper, bitsgap,Pionex, Quadency are very popular. Personally, I am using Pionex (https://www.pionex.com) Pionex is AUTOMATED Crypto TradingBot, its World’s 1st cryptocurrency exchange with in-built trading bots. Most interesting fact is, it's totally free. Also, you can use bituniverse (https://bot.bituniverse.org) it's also free. Bitunvierse and pionex are maintained by the same dev, so if you create one account, You can use both accounts with the same id password.

at Pionex the trading fees are only 0.05%, so why like to use Pionex. also there is 10 types of Bot available:
Grid Trading Bot
Reverse Grid Bot
Infinity Grid Bot
TWAP Bot
TTP Bot
Leveraged Grid Bot
Margin Grid Bot
DCA Bot
Leveraged Reverse Bot
Spot-Futures Arbitrage

I am very happy with pionex