Rune

Rune is a desktop development environment from unstable-build, "written in Go, obviously", released under GNU GPLv3 for macOS and Linux. Its organising idea, in the site's words, is that graphical developer tools "quietly exiled the power tools" of the terminal era; Rune puts a tiling window manager at the centre and treats shells, TUIs, builds and CLI coding agents as "peer tabs across tiled windows and workspaces" next to the editor, rather than as a panel inside it. Sourced so far only from its own site (rune-pricing and the product strings in the same bundle), so every claim here is first-party.

What the site claims it contains:

• A native character-grid GUI with GPU font rendering (Metal on macOS, OpenGL on Linux) — "without Electron or a JavaScript extension host". A terminal benchmarked with Alacritty's vtebench against Alacritty, Ghostty, Kitty, WezTerm, iTerm2 and Terminal.app on an M4 Max and an Intel Core m3 (box plots shown, numbers not extracted here).
• A daemon/client model for persistent buffers, processes and sessions; SSH as a workspace scheme (ssh://) where Rune provisions itself and its language packages on the remote host.
• A disk-backed symbol index for navigation "with no language server or cloud embeddings index required", shared between the engineer and the agent.
• A coding agent (agent and chat* commands), ACP-based external agents, "Terminal Threads" for CLI/TUI agents, and a best-of-N interface running up to eight isolated agents on separate worktrees.
• Modeless, Vim and Emacs editing layers; a Lua-free configuration surface plus an RPC SDK (the comparison pages count Neovim's Lua API and VS Code's extension marketplace as what Rune lacks).
• Rune Network, the managed private network between a user's machines — the only metered feature; see rune-pricing.

The site publishes head-to-head comparison pages against Cursor, Zed, Neovim, VS Code, Emacs and JetBrains, written by Rune. They are useful as a map of what Rune considers its competition — the agent-first editors and the terminal-native ones — and not as evidence about those products. One of them states that Cursor is being acquired by SpaceX in a $60 billion deal; that is Rune's claim, unchecked here and outside this spoke's subject.

Where it sits

This is the IDE stratum jetbrains opened and no source had filled: an editor as a tool, with its process model, terminal performance and licence as the subject. The coding agent inside it is ../agentic-tooling-wiki's kind of thing; Rune is the environment the agent runs in, and that is this spoke's.

Related

rune-pricing · unstable-build · jetbrains · git · developer-tooling