Overview

Nimbalyst is an open-source desktop workspace for building with coding agents. Run Claude Code, Codex, OpenCode and Copilot sessions in parallel, each isolated in its own git worktree, and organise them on a session kanban board instead of juggling terminal tabs. Beyond session management it adds visual WYSIWYG editors for markdown, Mermaid and Excalidraw diagrams, mockups, CSV and data models, plus inline diff review across every file type before you merge. Includes an embedded terminal, AI-assisted git commits, an extension system for custom editors, real-time collaborative editing for teams, and a companion mobile app for checking sessions away from your desk. Free for individuals with no feature limits, MIT licensed, and the successor to Crystal.

Pricing: Free for individuals (no feature limits) | Teams pricing available

Minimum macOS: 12.0 (Monterey)

Architecture: Apple Silicon, Intel

Key Features

Run Claude Code, Codex, OpenCode and Copilot sessions in parallel
Isolated git worktree per session so agents never collide
Session kanban board for organising parallel agent work
Inline diff review across every file type before merging
Visual WYSIWYG editors for markdown, Mermaid, Excalidraw, mockups, CSV and data models
Embedded terminal and AI-assisted git commits
Extension system for building custom editors
Real-time collaborative editing for teams
Companion mobile app for managing sessions on the go
Stable and alpha release channels with automatic updates
MIT licensed and fully open source
Free for individuals with no feature limits or trial period