Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Kick - Overcome shyness with actionable Kicks โค๏ธ
Anchor CMS - Free and lightweight blogging system
Birdbox - Team bookmarking and note-sharing.
Textpattern - Textpattern is an elegant content management system that is free, open source software.