Thanks so much for your votes and comments on this issue.
Atlassian is working hard on Atlassian Connect, Atlassian's strategic integration platform enabling ecosystem vendors to develop add-ons for Atlassian Cloud (OnDemand). Atlassian Connect 1.0 was released in March 2014, and you can already get access to more than 50 public add-ons today built using the platform.
Due to stability and scalability reasons, we will not bundle additional third party add-ons with our Cloud offerings. But you should feel free to contact the vendors of your favourite add-ons to let them know that you would like them to create a Cloud version of the add-on! We will do our best to work together with the vendor to satisfy this request.
Since we have no plans to bundle additional add-ons in Cloud, we are closing this issue.
JIRA Product Management
bartek (at) atlassian (dot) com