Robinhood - Free stock trading service.
Autocode - Build app-to-app API workflows with automatic codegen
Alpaca Data API - Free real-time stock market data API
Matador - Free investing + Social feed of trades + 2.5% on your cash
Ellevest - An investing platform built for women
Alpaca - Open links from Slack via desktop apps: Notion, Spotify, Zoom, Miro, Telegram, Airtable, Figma and VK.