Yes, both Astrola and KnowledgeBase offer a Free Trial.
Astrola is designed for Individuals, Large Enterprises, Medium Business and Small Business.
KnowledgeBase is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Astrola Starts at $20/Month whereas for KnowledgeBase Starts at $59/Month.
Some top alternatives to Astrola includes SmartSupport, Quickblog, Qualified, Workvivo, KnowledgeBase, QReviews, Bloggi, microletter, Polish, Growthingly, IFTTT and StructHub.
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.