Where can I find the API documentation?

For extensive documentation of our API offerings, please visit the IBKR API Home. Here, you will find resources to get started with the Web API, TWS API, Excel APIs, FIX and Third-Party Integrations.

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Where can I download the TWS API?
How do I get started with the TWS API?
Where can I find the Web API reference guide?
Can you provide a list of companies that have an app that uses IBKR's API?