WHO else offers API?

I was wondering how many online brokers/trading firms and Real time quote providers offer an API so users can write their own software to hook on their servers.

Is IB the only broker offering this service?
 
I would not advise bothering with the Patssystem API.

It's not an API for J-Trader to just put in orders but instead an
API to replace J-Trader. Can you say a lot of work? plus all
kinds of validation required because you have to go direct
to their servers.
 
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