The thing is, there is next to no software that "doesn't need further changes" at all. There is always something, sure it might be infrequent and/or most of the time nothing really big or difficult (except sometimes) but the point is: someone needs to step up and do it.

If a see a project with recent activity, best from multiple people it is a strong signal that this will happen, if the last commit is a year ago I must assume it's completely abandoned because most of the time it just is. Sometimes it's clearly communicated that it is the way because the authors see it as essentially feature complete, there are some examples of this but not that many honestly.