Open source e-portfolio:
http://my-world.typepad.com/
http://connect.educause.edu/Library/Abstract/EPortfolioforAssessmentSt/45579?time=1237540788
http://portal.acm.org/citation.cfm?id=1354010
http://elearning.thu.edu.tw/moodle/mod/resource/view.php?inpopup=true&id=13482

Def of e-portfolio:
http://edutechwiki.unige.ch/en/Learning_e-portfolio
http://www.oln.org/ILT/eportfolios.php
http://insight.eun.org/ww/en/pub/insight/school_innovation/eportfolio_scenarios.htm
http://www.danwilton.com/eportfolios/
http://electronicportfolios.org/blog/

Mahara
http://mahara.org/
http://www.jarche.com/2008/07/mahara-open-source-e-portfolio/

Sakai
http://sakaiproject.org/portal
http://www.nitle.org/www/events/891-campnitle-sakais-open-source-portfolio