Yes, both Helpjuice and KnowledgeBase offer a Free Trial.
Helpjuice is designed for Medium Business and Small Business.
KnowledgeBase is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Helpjuice Starts at $120/Month whereas for KnowledgeBase Starts at $59/Month.
Some top alternatives to Helpjuice includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Support Hub, HelpDesk, Jitbit Helpdesk, CRMdesk, ReadyDesk, Sitehelpdesk, HESK, Kiodesk, SmartSupport, HelpHub and KnowledgeBase.
Some top alternatives to KnowledgeBase includes KBPublisher, SmartSupport, KnowledgeBase Manager Pro, Omnistar Kbase, Talisma KnowledgeBase, IntelligenceBank KM, Helpjuice, KnowledgeOwl, Qualified, Workvivo, PaceKB and ProProfs Knowledge Base.