Padlet - Visual boards for organizing anything.
Zeal - Zeal is an API Documentation Browser.
Quizalize - Quizalize is a leading web-based and mobile-based classroom application that delivers the best and easiest way to differentiates your teaching.
DevDocs - Open source API documentation browser with instant fuzzy search, offline mode, keyboard shortcuts, and more
Popplet - Popplet is the simplest application to capture and organize your idea.
Snippely - Snippely is a basic text and code organizational tool.