How many Eclipse users are there?

Millions.

There is no definite number available on the number of Eclipse users worldwide. In the Executive Summary for the 2009 Eclipse Community Survey published in May 2009, however, the Eclipse Foundation claimed having millions of users, to quote: ‘Å“Eclipse is a large, vibrant, well established open source community with over 100 open source projects, 1,000 committers, 170 member companies, thousands of companies embedding Eclipse into products and applications and million [sic] of users’