Yes, both KnowledgeOwl and HelpHub offer a Free Trial.
KnowledgeOwl is designed for Large Enterprises, Medium Business and Small Business.
HelpHub is designed for Medium Business and Small Business.
Pricing for KnowledgeOwl Starts at $10,000/Year whereas for HelpHub Starts at $39/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 HelpHub includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, Freshdesk, Teamwork Desk, Support Hub, Motadata HelpDesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, LabiDesk, HESK, Helpjuice and KnowledgeBase.