@@ -124,6 +124,7 @@ The following projects implement ACP directly, connect ACP agents to other envir
 - [Paca](https://github.com/Paca-AI/paca) — self-hosted, AI-native project management where humans and ACP agents share the same board and sprints
 - [Threadlines](https://github.com/Threadlines/threadlines) - open-source desktop app for coding agents, with a live browser, terminal, and source control beside each thread. Runs Cursor, Antigravity and fx over ACP, plus agents from the ACP registry, alongside Codex and Claude Code, and several agents can share one thread (macOS, Windows, Linux)
 - [Fello](https://github.com/Zythum/fello) — open-source, agent-neutral desktop AI workspace for ACP agents and OpenAI-compatible APIs, with chat, files, terminals, diffs, project memory, MCP tools, WebUI remote access, and WeChat iLink (macOS, Windows, Linux)
+- [Happier](https://github.com/happier-dev/happier) - open-source, end-to-end encrypted, cross-device app to orchestrate Claude Code, Codex and other ACP agents on your own machines from desktop, phone and web
 
 ## Notebook and data tools