Docs as code, without having to be a coder. Like Google Docs, on files that never leave the repository: comment on a passage, reply, resolve, browse the docs in a tree, and publish without anybody being shown a rebase. The whole team works on the Markdown in your git repo, including the people who do not use git. Threads are committed beside the document; nothing is written into the Markdown. Free, no account, no server. macOS and Windows.