Best Knowledge Base Software for IT Companies

Hey everyone, I’m exploring the best knowledge base software options for an IT environment. We're aiming to improve how we document processes, share internal know-how, and reduce repeat questions across the team. Ideally, the tool should be easy to maintain, support collaboration, and integrate well with the platforms we already use.

These are some of the top-rated options on G2 that I’m currently considering:

1. Notion: Known for its all-in-one workspace approach, Notion blends docs, wikis, and task management. It's flexible and great for teams that want customization and clean UI—but how well does it scale for technical documentation?
2. ClickUp: Primarily a project management platform, ClickUp also offers a Docs feature that can double as a knowledge base. Curious how IT teams are using it for cross-functional documentation.
3. Slack: While not a traditional knowledge base, many teams use Slack as an informal source of shared info. Has anyone successfully turned it into a searchable, organized knowledge hub?
4. Guru: Built specifically for internal knowledge sharing, Guru uses browser extensions and Slack/Teams integrations to surface info where you work. Would love to know how well that works in practice for IT teams.
5. Confluence: A long-time favorite for technical documentation, Confluence is deeply integrated with Atlassian tools. Is it still the go-to for modern IT teams or starting to feel a bit heavy?

If you’ve used any of these or have a different favorite,I’d really appreciate your take. What’s working well for your team, and what would you do differently if you had to pick again?