Organizations can start submitting applications for Google Summer of Code 2017 on January 19 (and the deadline is February 9)
NumFOCUS will be applying again this year. If you want to work with us please let me know and if you apply as an organization yourself or under a different umbrella organization please tell me as well. If you participate with us it would be great if you start to add possible projects to the ideas page on github soon. We some general information for mentors on github.
We also have a template for ideas that might help. It lists the things Google likes to see.
In case you participated in earlier years with NumFOCUS there are some small changes this year. Raniere won't be the admin this year. Instead I'm going to be the admin. We are also planning to include two explicit rules when a student should be failed, they have to communicate regularly and commit code into your development branch at the end of the summer.