ManualsLib - Just enter the keywords in the search field and find what you are looking for!
MetaSurvey - MetaSurvey provides light and high engagement surveys for e-commerce.
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.
OpenStartup.dev - A collection of open startups
Manuzoid - Repository that includes user manuals for various products
Waves Insights - Consumer Insights SDK for Messaging Platforms