Participate in Portia Ideas
If you're interested in participating in GSoC 2015 as a student, contributing to Portia Ideas, you should join the portia-scraper mailing list and post your questions and ideas there. All Portia development happens at GitHub Portia repo.
Participate in Scrapy Ideas
If you're interested in participating in GSoC 2015 as a student, contributing to Scrapy Ideas you should join the scrapy-users mailing list and post your questions and ideas there. You can also join the #scrapy IRC channel at Freenode to chat with other Scrapy users & developers. All Scrapy development happens at GitHub Scrapy repo.
Participate in Splash Ideas
Splash doesn't yet have a mailing list, so if you're interested in discussing any of these ideas, drop us a line via email at firstname.lastname@example.org, or open an issue on GitHub. You can also check the documentation at https://splash.readthedocs.org/en/latest/.
All Splash development happens at GitHub Splash repo.