Robinhood - Free stock trading service.
Thinkorswim Mobile - Thinkorswim Mobile app features options so users can get all their desktop trading data at the palm of their hands to invest in the stock market or take their money out of the stock market.
Alpaca Fractional Trading API - Commission-free API to trade & invest for as little as $1
SprinkleBit - Crowdsourced investing, let's invest together!
Stonksfolio - Gain insight into the performance of stock & ETF investments
Tokenpad - Easiest way to co-invest in ICO token sales