I just came across a list of the top ten eportfolio websites:

1. mahara.org

2. electronicportfolio.org

3. osportfolio.org
Internet Laws, Internet Privacy, Laws, Law News, Legal

4. adobe.com
Featuring Photoshop, Illustrator and After Effects

5. truveo.org
Online video search engine

6. eportconsortium.com

7. epsilen.com

8. digication.com
Digication provides e-Portfolio and Assessment Management Systems for K-12 and Higher Education Institutions

9. r-campus.com
Free membership and usage. Create your academic presence, faculty and student websites and ePortfolios

10. eife-l.org
GANDI is a domain name registrar and cloud hosting company. Free website, SSL certificate, blog, and e-mail included. VPS dedicated

I haven't visited each website, but the sites that included a brief description, I copy and pasted under the link.