The Milkulski Archive for Space Telescopes (MAST) has created a page listing software related to the Kepler and K2 missions. The page includes a listing of software package, a brief description, the author(s), a link to the repository, and any associated references and/or documentation.
https://archive.stsci.edu/missions-and-data/kepler/related-software-1
Users are likely to find this page useful when searching for software to help in the retrieval and analysis of Kepler and K2 data.