Ecosystem

Software that implements or integrates with the Mark Protocol. First-party tooling lives in the main demarkus repository; third-party implementations are listed as they appear.

Browsers and readers

Caztor

Cross-platform Java GUI browser for Gemini, Spartan, Gopher, Nex, and Demarkus. By Kevin Boone.

Project page: kevinboone/caztor
Preliminary, view-only Demarkus support (FETCH latest version)
Runs on Linux, Windows, and macOS with Java 11+

Demarkus TUI

The reference terminal browser, built on Bubble Tea and Glamour.

Source: client/cmd/demarkus-tui
demarkus-tui -host mark://your.server/ — full FETCH / LIST / VERSIONS, link-following, graph view, mouse wheel, external URL launching

Plugins

Obsidian

Fetch, publish, and browse Demarkus documents directly from Obsidian.

Plugin repo: latebit-io/obsidian-demarkus — install via BRAT
Source: plugins/obsidian

Claude Code

Zero-config plugin for Claude Code: spawns a local demarkus-server, auto-generates a token, and wires the MCP tools on first session.

Source: plugins/claude-code
Install: /plugin marketplace add latebit-io/demarkus then /plugin install demarkus-memory@demarkus
Slash commands: /soul, /soul-journal, /soul-init
Skill: memory — triggers on “remember / recall / save / note” intents

Agent platforms

OpenClaw

ClawHub skill for OpenClaw agents. See the OpenClaw install guide.

CLI and server tools

Tool	Purpose
`demarkus-server`	Reference QUIC server
`demarkus`	CLI: fetch, list, publish, edit, graph
`demarkus-tui`	Terminal browser with graph view
`demarkus-mcp`	MCP bridge for LLM agents
`demarkus-token`	Capability-based auth token management
`demarkus-publish`	Direct-store writer for read-only server installs

Building your own

The protocol surface is small: QUIC with ALPN mark, a text request verb (one of FETCH, LIST, VERSIONS, PUBLISH, APPEND, ARCHIVE), and YAML-style ----delimited metadata in responses. Caztor’s read-only Java client is roughly a hundred lines. See the protocol reference for the full spec.

If you ship something that speaks Demarkus, open an issue or drop a link and we will list it here.