Yes, both Slab and GitBook offer a Free Trial.
Slab is designed for Medium Business and Small Business.
GitBook is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slab Starts at $35/Month when Billed Yearly whereas for GitBook Starts at $6.40/User/Month when Billed Yearly.
Some top alternatives to Slab includes Archbee, GitBook, Zoho Wiki, Drupal Wiki, LearnLode Enterprise, Matterial, TWiki, Wiki Valley, GoGoWorx and Kbee.
Some top alternatives to GitBook includes Confluence, simplewiki, Zoho Wiki, Drupal Wiki, TWiki, Wiki Valley, MeisterNote, Team Wiki, Obsidian and Dokit.
