Yes, both Guru and Slite offer a Free Trial.
Guru is designed for Large Enterprises, Medium Business and Small Business.
Slite is designed for Freelancers, Medium Business and Small Business.
Pricing for Guru Starts at $14/User/Month when Billed Yearly whereas for Slite Starts at $6.67/User/Month when Billed Yearly.
Some top alternatives to Guru includes GitBook, Zoho Wiki, KBPublisher, Drupal Wiki, LearnLode Enterprise, TWiki, Wiki Valley, GoGoWorx, HuForce and ProProfs Knowledge Base.
Some top alternatives to Slite includes Confluence, Notion, GitBook, Zoho Wiki, Drupal Wiki, LearnLode Enterprise, TWiki, Teamemo, Wiki Valley and Team Wiki.