Is there any open source software or a fund manager trades in my own account?
You told I am trying to get rich with arbitraging. As you saw I am fine with 20% per year. This is opposed to most of the BTC investors who want to maximize returns faster. My government gives bonds with 10% and I am fine with 20% when arbitraging.
You can look at open source software if you want, since this will give you an idea of what it is needed for a bot to function as it should when taking arbitrage opportunities, however we are talking here about letting a piece of software to manage your finances, I would not trust any software developer for that as you could lose all your money if there is a virus or any other form of malware hidden, and this means that if you want to trade this way, you do not really have any other option than to create your own bot.