Yes, both KnowledgeOwl and Notion offer a Free Trial.
KnowledgeOwl is designed for Large Enterprises, Medium Business and Small Business.
Notion is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for KnowledgeOwl Starts at $10,000/Year whereas for Notion Starts at $4/Month when Billed Yearly.
Some top alternatives to KnowledgeOwl includes simplewiki, KBPublisher, SmartSupport, Drupal Wiki, Talisma KnowledgeBase, Microsoft Azure, HelpHub, GoGoWorx, KnowledgeBase and ProProfs Knowledge Base.
Some top alternatives to Notion includes Jira, Knote, Trello, Confluence, Asana, Easynote, ClickUp, TWiki, MeisterNote and Zenkit Hypernotes.