If you’re a GitHub user, but you don’t pay, this is a good week. Historically, GitHub always offered free accounts but the caveat was that your code had to be public. To get private repositories, you had to pay. Starting tomorrow, that limitation is gone. Free GitHub users now get unlimited private projects with up to three collaborators.
The amount of collaborators is really the only limitation here and there’s no change to how the service handles public repositories, which can still have unlimited collaborators.