We at vogella GmbH recently started to use Bintray for the distribution of Eclipse p2 update sites. Bintray is a content delivery system which offers free hosting for Open Source projects. Bintray offers a REST API to upload content and we have written a small shell script which uploads the content of a p2 update side to Bintray and activates it.
You find it at Github https://github.com/vogellacompany/bintray-publish-p2-updatesite/. Pull requests to improve the script are welcome.
I used Bintray-Examples as blueprint for the script. This repo had an example how to upload a RPM to Bintray.