Yes, both Proceed.app and Guru offer a Free Trial.
Proceed.app is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Guru is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Proceed.app Starts at $39/Month whereas for Guru Starts at $14/User/Month when Billed Yearly.
Some top alternatives to Proceed.app includes Synapse, Guru, Zoho Wiki, LearnLode Enterprise, TWiki, GoGoWorx, HuForce, XWiki, Zoho Learn and bundleIQ.
Some top alternatives to Guru includes GitBook, Zoho Wiki, KBPublisher, Drupal Wiki, LearnLode Enterprise, TWiki, Wiki Valley, GoGoWorx, HuForce and ProProfs Knowledge Base.