Currently there are almost 1.400 plugins available (strictly add-ons). Many are JIRA plugins but also for Confluence and the rest of the Atlassian's products.
So I would say HUNDREDS is more accurate than THOUSANDS.
Well, it's true that the ecosystem is growing at a very fast pace...
And the ones that are written internally?
Just because they're not published in Marketplace, doesn't mean they aren't there. I'm aware of probably another fifty, just from a handful of users. There's a lot of duplication, and I push people to use the public ones where-ever I can, but I'd suggest "thousands" is still a valid estimate. Hundreds on marketplace, and those are, rightly, the most used ones.
Thousands, and there's no real way to answer the question.
Look in the marketplace to get some basic numbers out. Bear in mind that there are open-source, free, commercial. Then remember that there are loads more that people have written that are NOT in the marketplace, so you can't get numbers for them.
You might actually get a far more useful answer if you told us why you're asking this question. I can't imagine why it matters for most people, although I have seen people use it to compare with other software, which is an exercise in complete pointlessness because it tells you nothing useful.
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