The best alternatives to Matterwiki are Tettra, Wikifox, and WikiWand. If these 3 options don't work for you, we've listed a few more alternatives below.
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General Collaboration— One inbox for all your work discussions
Tettra is an AI powered knowledge management system that lets you:
1. Curate important company information into a knowledge base
2. Instantly answer team questions in Slack via an AI powered bot
3. Keep your knowledge up-to-date and organized with automation
Wikifox (beta) is a clean and simplified version of the real Wikipedia! This works with official Wikipedia, so nothing to worry about!. It has a good and clean user interface with Dark, Light and custom themes! Check it out : https://wikifox.ml/