Most organisations asking about FAQ software do not need FAQ software. If you have fifteen answers, one language and one audience, a well-structured page on your existing site will serve readers better than a separate application with its own login, its own theme and its own update cycle. Say that out loud before you install anything, because a half-populated knowledge base is worse than no knowledge base at all.
A dedicated FAQ or knowledge base system starts earning its keep at the point where four specific things become painful at once: search across a few hundred answers, categorisation deep enough to browse, more than one language, and permissions so that some articles are staff-only while others are public. Add revision history, an approval workflow and a glossary, and you are describing a product rather than a page. phpMyFAQ is the open-source application in this category, maintained by Thorsten Rinne since 2001, with the 4.1 line current and 4.2 in development during 2026.
The commercial comparison is help-desk suites rather than standalone FAQ tools. Zendesk bundles its help centre into Suite plans at £45 per agent per month for Suite Team on annual billing in the UK, rising to £89 for Suite Professional. Freshdesk, Document360 and HelpJuice sell similar things on similar models. Self-hosting removes the per-agent meter, which matters most for organisations where the people writing the articles outnumber the people answering tickets.