elabFTW
elabFTW is a free and open-source electronic lab notebook designed for research labs and experiment tracking. https://www.elabftw.net/
Quip
Quip is a connected hub where teams create, discuss, and organize their work from any device. https://quip.com/
Textflow
TextFlow is special layout designed to lay out rich text. It can be used to layout several text nodes in a single text flow. https://docs.oracle.com/javase/8/javafx/api/javafx/scene/text/TextFlow.html
Authorea
Authorea is a research paper writing tool where more than 65,000 researchers in fields from Astronomy to Zoology write their documents online. https://www.authorea.com/
Penflip
Penflip is an online tool for collaborative writing, editing, and publishing. https://www.penflip.com/