What are some alternatives?
MadCap Flare - Documentation for Any Audience, Language or Format
Helix ALM - Helix ALM is the single, integrated application that lets you centralize and manage requirements, test cases, issues, and other development artifacts and their relationships.
Dr.Explain - Dr.Explain software is a help file authoring tool.
Atlassian Bitbucket Server - Atlassian Bitbucket Server is a scalable collaborative Git solution.
HelpSmith - HelpSmith is a help authoring tool to create CHM HTML help files, manuals, and PDF documents.
codeBeamer ALM - Integrated application lifecycle management (ALM) platform