Important for low-bandwidth users and sites, these themes are often cleaner and less cluttered than heavier themes.

WordPress themes

• Appropedia's 13 theme for WordPress - a pared down theme used on http://blogs.appropedia.org

These haven't been tried (by me --Chriswaterguy 06:38, 30 November 2009 (UTC)) but look promising:

• Lightweight – Free WordPress Theme - purely CSS, no images. And A Lightweight Child Theme
• Super Lightweight Wordpress Theme "Mini"

Proprietary (non-open) options

• Maneno online platform