https://marcosdumay.com
A couple of projects:
https://sealgram.com
A set of email extensions that make it possible to run a PKI over SMTP, making email privacy easy to achieve.
And, besides the extra privacy, the PKI needed shared data and access control, what led me to create a DAV-like system, that lets you share your mailbox over the net, by granting capabilities.
http://marcosdumay.com/rapid-django
A CRUD generator for DJANGO, 'cause I couldn't find any good one.