Are there any apps or tools that you find particularly helpful?

I have seen a few apps mentioned, but I prefer to use excel and log everything that way. 

Find a good lawyer you can make a relationship with to have in your back pocket should you need to sue, use strong contracts, use work tracking apps like busybusy, always have a couple of different contractors on speed dial so you can fire them and replace them immediately. you've got to be bullish, have strong goals in mind.

.- Working a W2 as a firefighter, posting and consuming content- Leaving my W2 to dive deep into real estate investing and working as an agent... and still watching/posting content all while business was ok - Deleting social media apps (one have one on my phone that I use 10 minutes or less a day), diving deep into building my business and skills which have drastically increased due to pure focus and increasing my business significantly- moral of the story... focus on the things you need to do in business (dollar productive activities) and life experiences while reducing consumption will increase your success  

Now all plans include List Stacking AND all plans now include the Driving For Dollars app.

So was hoping someone knows of a similar app or website but geared toward investors.

I don't have personal experience with it, but when the app was first developed, I contacted the developer and put the app through a fairly robust test usage to see if it's something I would want to recommend to my clients (I'm a CPA).I think the app is great for its intended purpose and I do recommend it to my clients now (and have for about 18 months now). 

Fortunately, most of the apps today are cloud based and have an app to make that easier. 

Basically does it all and the customer service and response time on the in app or online chat is insanely fast. 

Right now, I am an aspiring real estate agent specializing in investment properties while also in the process of developing an app!