Please feel free to add any others that you know of. I’m not associate with any of these and I’m also not vouching for the quality of any of them.
- Google Finance - Free
- Yahoo Finance - Free
- TenQuant - Free
- EDGAR - Free
- IEXCloud - Cheap
- AlphaVantage - Free/Cheap
- WorldTradingData - Free/Cheap
- Tiingo - Free/Cheap
- Quandl - Some Free
- Norgate Data - Free Trial / Moderately priced
- Intrinio - Moderately priced
- Polygon - Expensive
- Xignite - Free Trial / Might be expensive
- BarChart - Might be expensive