There are some "blessed" recommendations at https://packaging.python.org/guides/tool-recommendations/ (the Python Packaging Authority is about as official as you're going to get), but this boils down to it being a large open source community. No one's going to cull other people's efforts, but tools do merge on occasion (e.g. the functionality of https://github.com/erikrose/peep has been merged into pip, so peep is deprecated now).