For example, we built and maintain [Mail for Good](https://github.com/freecodecamp/mail-for-good), which nonprofits (including freeCodeCamp.org itself) can use to send emails at a mere fraction of traditional email services (it only costs $1 to send 10,000 emails).
Clone one of these repositories, get it running locally on your computer, then start browsing the repo's open issues for an issue to work on. If you have questions, you can ask any time in the [Contributors section of our forum](https://www.freecodecamp.org/forum/c/contributors)