ProProfs Knowledge Base - ProProfs Knowledge Base is a cutting-edge knowledge management software that assists businesses to reduces support tickets by self-help and create online manuals, guides, wikis, documentation, FAQs and more.
Padlet - Visual boards for organizing anything.
Baklib - Make your knowledge base & help document online
BookWidgets - BookWidgets is an excellent application that let you create engaging exercises in minutes and easily share a varied variety of beautiful and fun activities with your classroom and others.
Solina Mind Mapping - Solina Mind Mapping is a smart mind mapping program and editor for capturing, refining, organizing and sharing the ideas with others.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.