LibreOffice - Roles and responsabilities - OpenOffice

Firstly, let's go to see the case of LibreOffice, these are the different roles:

QA Tester
        Triage, prioritize and do in-depth analysis of bug reports and feature requests
        Do manual testing and test reporting
        Take part in localization QA.


UX/Visual Designers
        Design provides the visual basis for any tool.
        Transport usability, quality and emotions.
        Improving LibreOffice by visual means, inside the office suite, in user interaction and at any place where the product.
   
Localizers
        Help localize the LibreOffice user interface
        Help files into his language

Documenters
        Work on user guides and LibreOffice's built-in help system as part of the LibreOffice documentation team.
        Writing and reviewing are a key part of the workflow.
        Recruiting people to help out in other ways: screenshot production, indexing...

Marketers
        Attend FOSS events as part of an official Foundation Team.
        Publicize LibreOffice and The Document Foundation in media, at fairs and other events, etc.
        Take part in creating content and coordinating activities for special marketing initiatives.
        Work on research (such as marketing and feature research for future versions, usability research, etc.) 

Developers
        Work on code for the LibreOffice code base and extensions.
        Work on bug-fixing and submitting patches.

Web Admins
        Maintain and develop LibreOffice and Document Foundation online infrastructure: websites, servers, etc.

Donate
        Making a donation to help fund the community's work.

On the other hand, in Apache OpenOffice we can find

Observer
        Views, but does not change project resources.
        Read-only access to most project resources.
        Read-only access to web content and source code (CVS).
        Submits issue to issue tracking (IssueZilla)
        Subscribes and posts to project mailing lists.

Developer
        Contributes directly to project -- source code and HTML.
        Gains write access to most project resources.
        Write access to HTML, news utility, files utility, CVS, Issuezilla.
        Mailing list privileges the same.

Content Developer
        Contributes directly to project's web content (HTML).
        Gains write access to project's HTML, news utility, files utility, and Issuezilla.
        Mailing list privileges the same.

Project Owner
        Defines the project's overall mission, direction, methodology, and community make-up.
        Gains administrative access to all Project functions.
        Grants members requested permissions on project.
        Administers all project mailing lists and is default moderator on all lists.
        Administers Issuezilla.
        Project Owner role supersedes any other roles you may hold on a project.

It is important to note that LibreOffice seems to have a model of roles more detailed and richest, and with some specify role, like QA testers, Marketers, and Localizers.

References:
[0] LibreOffice - Get involved
[1] Apache OpenOffice Roles