Modern hardware. Retro experience.
A modular retro-computing interface engine for games, physical media, fictional computer systems, and interchangeable interface shells.
Website • Live Browser Demo • Roadmap
Veyllisto has a browser-based interactive demo that lets you experience the interface without installing anything.
The demo includes:
- Animated terminal boot
- Categorized Game Library
- Favorites and Recent Games
- Simulated Physical Media
- Callisto Green, Amber, and White themes
- Auxiliary Display simulator
- Settings
- Maintenance Terminal
- Advanced Terminal demonstration
The browser demo is a safe simulation and does not access the visitor's files, Steam library, USB devices, or host operating system.
Veyllisto is not intended to be another conventional game launcher.
It is an attempt to make modern hardware feel like a dedicated fictional computer system again.
Instead of exposing separate launchers, emulator folders, ROM directories, removable drives, and desktop shortcuts directly to the user, Veyllisto places them behind a unified Engine and lets interchangeable Shells determine how that system feels.
One Engine. Shared state. Multiple experiences.
The current first-party reference experience is the Veyllisto Terminal, built from the original Callisto-inspired terminal project.
Current systems include:
- Unified Game Library
- Steam integration
- Emulator / ROM launching
- Favorites and Recently Played
- Game metadata
- Physical-media detection
- Metadata-only launch keys
- Self-contained physical game media
- Multi-game physical collections
- Built-in Physical Media Creator
- Safe removable-media writing and verification
- Auxiliary-display support
- Theme-owned semantic audio
- Configurable machine identity
- Authenticated Maintenance Terminal
- Advanced Terminal
- Controlled Desktop Mode
- Process-level Veyllisto restart
- Protected host reboot / shutdown actions
Physical media is one of Veyllisto's defining systems.
Physical media represents software. It does not require the software to physically reside on that media.
A removable device can act as:
- A metadata-only game key
- A self-contained game medium
- A multi-game collection
- A reusable physical representation of software already installed elsewhere
The built-in Physical Media Creator lets users generate compatible media from inside Veyllisto without manually looking up internal game IDs.
The authenticated Maintenance Terminal provides controlled access to:
- Desktop Mode
- Advanced Terminal
- System Diagnostics
- Terminal Settings
- Media Tools
- Reboot Terminal
- Restart Veyllisto
- Host reboot / shutdown confirmation
- Return to normal operation
Maintenance access is intentionally separate from the normal user experience.
Veyllisto v1.0 is planned to ship with four first-party interface Shells.
 Terminal Keyboard-first immersive retro terminal |
 Classic Desktop Late-80s / early-90s graphical desktop |
 Living Room Controller-first television / couch experience |
 Arcade Cabinet-style game-first experience |
Shell concept previews — final interfaces may change before v1.0. All four Shells use the same underlying Veyllisto Engine and shared state.
A user should not need separate game libraries, favorites, metadata, emulator configuration, or recent history for every interface.
VEYLLISTO
INTERFACE ENGINE
│
┌───────────────┼───────────────┐
│ │ │
▼ ▼ ▼
SHELLS THEMES IDENTITY
│
▼
┌─────┼────────┬───────────┐
│ │ │ │
▼ ▼ ▼ ▼
TERM DESKTOP LIVING ARCADE
ROOM
│
└──────────────┐
▼
SHARED ENGINE
├─ Library
├─ Metadata
├─ Steam
├─ Emulators
├─ Favorites
├─ Recents
├─ Physical Media
├─ Configuration
├─ Audio
├─ Auxiliary Display
└─ Maintenance Services
The Engine owns shared functionality. Shells control presentation and interaction.
Latest completed milestone: v0.31 — Maintenance Terminal
Next development milestone: v0.32 — Guided First-Launch Setup
Primary release target: Windows
License: MIT
| Version | Milestone | Status |
|---|---|---|
| v0.29.0 | Physical Media Creator | ✅ Complete |
| v0.30 | OLED / Auxiliary Display Support | ✅ Complete |
| v0.31 | Maintenance Terminal | ✅ Complete |
| v0.32 | Guided First-Launch Setup | 🚧 Next |
| v0.33 | Appliance Mode | ⏳ Planned |
| v0.34 | Boot Maintenance Console | ⏳ Planned |
| v0.35 | Deployment Build | ⏳ Planned |
| v0.36 | Classic Desktop Shell | ⏳ Planned |
| v0.37 | Living Room Shell | ⏳ Planned |
| v0.38 | Arcade Shell | ⏳ Planned |
| v0.39–v0.99 | Shell Integration, Polish & Stabilization | ⏳ Planned |
| v1.0 | Initial Public Release | 🎯 Target |
See the full ROADMAP.md.
Veyllisto-Interface-Engine/
│
├── engine/
├── shells/
├── themes/
├── config/
├── assets/
│ ├── branding/
│ ├── screenshots/
│ ├── shells/
│ └── demo/
│
├── README.md
├── ROADMAP.md
├── ARCHITECTURE.md
├── CONTRIBUTING.md
├── PROJECT_HISTORY.md
└── LICENSE
Veyllisto Interface Engine is open source under the MIT License.
Contributions may include:
- Bug fixes
- Documentation
- Themes
- Community Shells
- Emulator profiles
- Platform compatibility
- Hardware builds
- Accessibility improvements
- Testing
- Feature ideas that fit the roadmap
See CONTRIBUTING.md.
- Website: https://veyllisto.com/
- Live Demo: https://veyllisto.com/demo/
- Roadmap:
ROADMAP.md - Architecture:
ARCHITECTURE.md - Contributing:
CONTRIBUTING.md
Modern hardware. Retro experience.
Big vision. Small versions. Stable checkpoints. No chaos.