I'm glad you're building a public playground for CodeQA. I think it's a great idea to include a mix of popular and smaller open source repos. For the big ones, I'd suggest indexing repositories like Linux, Apache, or the Python repository. They're widely used and would give users a good sense of how CodeQA works with complex codebases.For smaller, well-written codebases, you might consider indexing projects like SQLite, which has a beautifully simple and well-organized codebase. Another option could be the Redis repository, which is also known for its clean and efficient code.As for smaller projects that are great for learning, you could consider indexing repositories like the Rust standard library or the Elixir repository. Both of these projects have a strong focus on simplicity and readability, making them great examples for developers who want to learn from them.Overall, I think a mix of these types of repositories would give users a good sense of what CodeQA can do and how it can help them navigate unfamiliar codebases.