waydev
Yes, both Tettra and Proceed.app offer a Free Trial.
Tettra is designed for Large Enterprises, Medium Business and Small Business.
Proceed.app is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Tettra Starts at $8.33/User/Month when Billed Yearly whereas for Proceed.app Starts at $39/Month.
Some top alternatives to Tettra includes Zoho Wiki, KBPublisher, Drupal Wiki, TWiki, KnowledgeBase Manager Pro, Omnistar Kbase, Talisma KnowledgeBase, KnowledgeOwl, KnowledgeBase and ProProfs Knowledge Base.
Some top alternatives to Proceed.app includes Synapse, Guru, Zoho Wiki, LearnLode Enterprise, TWiki, GoGoWorx, HuForce, XWiki, Zoho Learn and bundleIQ.