Acorn Investing - This money savings app I had some concerns about when I first started using it, it was a some point on Shark Tank so I knew there was going to be a catch. But I have used it and found that it is making me money. Every purchase I make the app rounds up to the dollar. So purchases made of .75 cents the round up which is invested after a few days would be .25 cents. They wait until it adds up to $5.00 before they take the payment to invest your money from all your purchases. Some banks do this automatically from debit/checking accounts and invested in there savings accounts. So if you don't have this with your bank start here to begin small investments.
Loyal3 - Want to invest in the stock market and low on funds? Loyal3 has companies willing to start small with low minimums or also you can do weekly, bi-weekly, or monthly small investments. These funds can purchase factions of shares depending on your budget.