669
I know 69 languages
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Make sure you are including basic, qbasic ,quick basic, ti-basic, visual basic, and visual basic for applications. You gotta pump those numbers up
Now that you mention it, I might have used as many different basics as all other languages combined.
In addition to those you listed, I've used VIC basic, Apple Basic, Pick Basic, Z-Basic (that one was nice, with a cross platform compiler and device independent graphics) and I bet there are a couple I've forgotten about.