Over the years I've amassed a large collection of links, resources, tools and so on that I find useful in my trading/investing activities. I'm compiling those here, along with any that were shared with me via Twitter/Reddit/email/etc and seemed useful after a cursory look. While I've done my best to link to tools that are not only legitimate but also likely to stay active, alive and useful for the foreseeable future, obviously I have no control over these companies/websites and over time some of the links may break or situations may emerge that turn them into poor recommendations. Also, this list is not exhaustive by any means and may be updated in the future as new tools/resources emerge.
Free and get instant access to stock, forex, cryptocurrency, investment fund and fundamental market data. Real time, historical, and EOD data.
Multiple payment tiers for access. The free access tier is limited to 8 access requests per minute, 800 access requests per day, and is limited to basic professional data only.
A service which tries to make it easy to do paper and algorithmic trading. Paper trading is read-only access to live market data, which is exactly what I need.
Rate limit: 200 requests/API key/minute
API keys are transmitted in headers.
A site that keeps track of the statuses of various Tor network markets. No RSS, no API, can probably scrape it.
Stocktwits' list of stock symbols for companies that haven't gone public yet.
3747 links, including 223 private