Notion has a similar WYSIWYG editor to GitBook and clean published site UX.

See my Notion open guide.

openguide.notion.site/openguide/Notion-f2be2968060847d08307f685d2af861d

GitBook has a solid WYSIWYG editor and GitHub syncing.

See my GitBook open guide.

openguide.gitbook.io/gitbook/

Skiff has a WYSIWYG editor with great security features like multi-factor authentication (MFA), decentralized IPFS storage, and sign-in with Ethereum (SIWE).

See my Skiff open guide.

app.skiff.com/docs/30e628c2-ad96-499c-9955-29c76d87e739#gynNAXdPNN2hkOByLitx%2Bb5jAygdM7Q9OUfYBNkVWOA%3D

Other great Markdown tools if a "what you see is what you get" (WYSIWYG) editor is important to you are Skiff.com, GitBook.com, and Notion.so.

en.wikipedia.org/wiki/WYSIWYG

• GitHub two-way sync (And GitLab with an enterprise account)
• Custom UX with Markdown
• Future option to self-host with platforms like Arweave
• The team is very responsive in answering questions and solving problems

✨ Favorite features

• Sites adapt to any screen size (Easy to edit on mobile too!)
• Include auto-generated table of contents + global navigation on any screen size
• Copy + paste all content types works compared to other Markdown publishing tools
• Custom readable URLs