Stack Exchange Glossary - Dictionary of Commonly-Used Terms
What are people referring to when they talk about the Stack Overflow "trilogy"? Sometimes they refer to it as the Stack Exchange trilogy...
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I had this question myself:
As detailed on the official blog, the Stack Overflow trilogy includes the first three projects:
Their successes spawned the implementation of the StackExchange.com network with the multitude of Q&A websites you see today.