UserGuiding - Create in-app experiences with the most straightforward product adoption platform — quick implementation, lasting user engagement.
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
Core2D - A multi-platform data driven 2D diagram editor.
Userlane - Digital adoption platform with interactive guidance for software applications allowing anyone to understand and master any software from the get-go.
JavE - JavE (Java Ascii Versatile Editor) is a free Ascii Editor.