ManualsLib - Just enter the keywords in the search field and find what you are looking for!
UserGuiding - User onboarding made easy, for less. Create product walkthroughs in a couple of clicks, without breaking the bank.
Manuzoid - Repository that includes user manuals for various products
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
ManualAgent - Manuals and guides
Userlane - Digital adoption platform with interactive guidance for software applications allowing anyone to understand and master any software from the get-go.