What are some alternatives?
When comparing Acknow and Helpie Knowledge Base Wiki Plugin, you can also consider the following products
Document360 - Self-service knowledge base software focused on SaaS Products & Enterprise Software Projects.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
HelpJuice - Helpjuice is easy-to-use knowledge base software that guarantees. 50% less support emails and happier customers.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
ProProfs Knowledgebase - ProProfs Knowledge Base is a cutting-edge knowledge management software that assists businesses to create online manuals, guides, documentation, FAQs and more.
AMuseWiki - Amusewiki is more than just a wiki engine, it’s also a powerful authoring, archiving and publishing platform.