Yes, both GitBook and Confluence offer a Free Trial.
GitBook is designed for Large Enterprises, Medium Business and Small Business.
Confluence is designed for Large Enterprises, Medium Business and Small Business.
Pricing for GitBook Starts at $6.40/User/Month when Billed Yearly whereas for Confluence Starts at $8.33/User/Month when Billed Yearly.
Some top alternatives to GitBook includes Confluence, simplewiki, Zoho Wiki, Drupal Wiki, TWiki, Wiki Valley, MeisterNote, Team Wiki, Obsidian and Dokit.
Some top alternatives to Confluence includes Jira, Microsoft SharePoint, Google Workspace, GitBook, Zoho Wiki, Drupal Wiki, TWiki, Wiki Valley, XWiki and Team Wiki.