How can I find active, well-known open-source projects to contribute to?

A good starting point is software you already use or understand. Look for the open-source project behind it, an open-source alternative, or related tools. Popular projects often require some domain knowledge, so it’s much easier to contribute when you already understand the software and its users. Check the recent commit history, issue activity, pull requests, documentation, and release history before choosing one.

Good-first-issue lists can be outdated, so treat them as a starting point rather than a guarantee. Search directly for active repositories in the languages you know, then inspect their open issues, recent releases, contributor activity, and contribution guidelines. If no suitable issue exists, improving documentation, adding tests, fixing a small bug, or first opening a clearly described issue can be a better way to get involved than forcing yourself into an unfamiliar task.

The best issues usually come from personally using the project. While using it, keep track of bugs, confusing behavior, missing documentation, or features that would make your workflow easier. Before working on an issue, check whether maintainers are responding and whether recent contributions are being merged. A repository’s star count matters less than consistent activity and a welcoming contribution process.