Yes, both Berkeley Publisher and GitBook offer a Free Trial.
Berkeley Publisher is designed for Large Enterprises, Medium Business and Small Business.
GitBook is designed for Large Enterprises, Medium Business and Small Business.
The starting price of GitBook begins at $6.40/User/Month when Billed Yearly, while pricing details for Berkeley Publisher are unavailable.
Some top alternatives to Berkeley Publisher includes WeWeb, simplewiki, GitBook, Drupal Wiki, TWiki, Wiki Valley, Microsoft Azure, HintEd, Kbee and ProProfs Knowledge Base.
Some top alternatives to GitBook includes Confluence, simplewiki, Zoho Wiki, Drupal Wiki, TWiki, Wiki Valley, MeisterNote, Team Wiki, Obsidian and Dokit.