Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.

BlueG.com - BlueG is the personalized web dashboard and startpage with all of your interests in one place.

Anchor CMS - Free and lightweight blogging system

fastBMK.com - Fast, lightweight and reliable bookmarking service.

Textpattern - Textpattern is an elegant content management system that is free, open source software.

Collectably - Collectably Saves Open Tabs into Neat Visual Boards For Collaborative Bookmarking