Downloads

MontaukOS 0.1.6

July 8, 2026 - hotfix

It is recommended that users run MontaukOS in a virtual machine rather than on real hardware.

Links

Download ISO
License
Tutorials/Manual

Fixed

• Fixed a boot failure on VirtualBox VMs configured with legacy BIOS
• PCI: I/O-space BARs are no longer treated as MMIO addresses

Known issues

• Intel GPU may struggle to wake up from S3 sleep, causing a black screen requiring a reset. S3 sleep is highly experimental and users are discouraged from relying on it.
• For certain file copy operations in the Files app, pasted files may incorrectly paste as directories.
• Floating-point calculations do not work properly in the Lua interpreter.
• Due to licensing restrictions, the proprietary DOOM WAD cannot be shipped. The DOOM engine thus crashes on launch unless the user supplies a compatible WAD file.

Included in ISO

• MontaukOS SMP kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/os/certs/ca-certificates.crt)
• Intel Bluetooth controller firmware (0:/os/firmware/intel)
• Third-party license texts and notices (0:/os/licenses)
• Tiny C Compiler (tcc) with MontaukOS headers and libraries (0:/lib/tcc)
• Lua 5.4 interpreter (lua) with headers and static library (0:/lib/lua)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM engine with SDL_mixer audio support (game data not included)
• Experimental HTTP server (httpd) and default page (0:/www/index.html)
• Default wallpaper - blossoms by Nikhil Kumar, Unsplash (0:/os/wallpapers)

MontaukOS 0.1.5

July 8, 2026

It is recommended that users run MontaukOS in a virtual machine rather than on real hardware.

New

• New Character Map app (charmap)
• New Power app (powermgr) for CPU power and thermal monitoring
• CPU power and thermal management for Intel CPUs
• Software-defined radio support: RTL-SDR (RTL2832U + R820T2) USB driver, kernel radio APIs, and an sdr demo tool
• Intel Bluetooth firmware loading performance improvements
• New default login-screen wallpaper (0:/os/wallpapers/default.jpg), used when no wallpaper is configured

Fixed

• Fix partially broken Bluetooth pairing and reconnection
• Bluetooth audio (A2DP) setup and reconnection reliability
• HCI events spanning multiple USB packets are now reassembled correctly, fixing Intel Bluetooth controller bring-up hangs
• Bluetooth MAC addresses are now displayed in conventional MSB-first byte order in the userspace Bluetooth app
• Fixed the desktop app loading cap
• Cleanup: shared libraries renamed to drop the lib prefix, leftover test programs removed

Licensing

• MontaukOS 0.1.5 is source-available: the MontaukOS Software License permits use, study, modification, and free redistribution with attribution (commercial distribution still requires permission)
• Third-party license texts and notices now ship on the ISO (0:/os/licenses/), covering the Flat Remix icon theme (GPLv3), the DOOM engine (GPLv2), the Tiny C Compiler (LGPL-2.1), Lua (MIT), the bundled fonts (OFL-1.1 for JetBrains Mono, Noto Serif, and Roboto; AGPLv3 with font-embedding exception for C059), the Mozilla CA certificate bundle (MPL-2.0), Intel Bluetooth firmware (Intel redistributable license), and other components
• The proprietary DOOM shareware WAD (doom1.wad) is not distributed; the DOOM engine still ships, but users must supply their own game data

Included in ISO

• MontaukOS SMP kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/os/certs/ca-certificates.crt)
• Intel Bluetooth controller firmware (0:/os/firmware/intel)
• Third-party license texts and notices (0:/os/licenses)
• Tiny C Compiler (tcc) with MontaukOS headers and libraries (0:/lib/tcc)
• Lua 5.4 interpreter (lua) with headers and static library (0:/lib/lua)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM engine with SDL_mixer audio support (game data not included)
• Experimental HTTP server (httpd) and default page (0:/www/index.html)
• Default wallpaper - blossoms by Nikhil Kumar, Unsplash (0:/os/wallpapers)

MontaukOS 0.1.4

June 21, 2026

New

• Shell tab completion for executables, built-in commands, and files in the working directory
• New console session mode for text-mode operation
• New shell commands:
  • proclist - list running processes
  • btlist - list connected Bluetooth devices
  • btbonds - list bonded (paired) Bluetooth devices
• Bluetooth app now shows paired devices, and the Bluetooth stack supports MAC address spoofing
• Bluetooth audio (A2DP) playback reliability improvements
• Crash reporting now works from console sessions as well as the desktop
• New bootloader-agnostic Boot Contract, decoupling the kernel from the bootloader
• C API syscall numbers for the bundled TCC compiler are now auto-generated and verified at build time

Fixed

• Fixed an NVMe completion-queue desync that could break all disk reads
• Fixed TCP/IP stack bugs
• Fixed an SMP race in the kernel crash-report ring buffer, and guarded against crash-handler crash loops
• Fixed Terminal scrolling and zoom inconsistencies
• Fixed scrolling cutoff for the last entry in Device Explorer
• Fixed UI issues in Files app dialogs
• Fixed a TLS (secure networking) bug affecting system programs
• Performance improvement in the kernel string-stream helper
• Numerous additional kernel, shell, and desktop bug fixes

Included in ISO

• MontaukOS SMP kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/os/certs/ca-certificates.crt)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM Shareware game with SDL_mixer audio support
• Experimental HTTP server (httpd) and default page (0:/www/index.html)

MontaukOS 0.1.3

June 7, 2026

New

• New 2048 game
• New Audio app with a system audio mixer for per-application volume control
• Bluetooth audio (A2DP) support, including Intel Bluetooth controller firmware loading
• USB mass storage device support, with hotplugging and removable medium detection in Files
• SVG image support in Image Viewer, including vector zoom
• New Network Configuration applet, backed by kernel network statistics reporting
• Process Manager gains a Performance tab with CPU usage graphing (kernel now exposes CPU time)
• Scheduler now supports threading
• xHCI BIOS-to-OS handoff
• Login screen rebuilt on the MTK toolkit, with faster drawing and a shutdown progress display
• Graceful shutdown and reboot: Bluetooth devices are disconnected and disks are flushed
• Files app improvements:
  • Selection marquee, now also in list view
  • Properties dialog for single and multiple files
  • Delete confirmation for directories
  • Refresh button and USB medium detection
  • Support for folders with more than 64 entries
  • 64-bit file sizes
  • Asynchronous copy, move, and delete with a progress dialog
• MTK GUI toolkit improvements:
  • New graphing widget
  • New scrollbar widget, with scrollbars standardized across apps
  • Improved input boxes
  • Right-click context menus
• Accent colors respected in more desktop components, including print dialogs
• Word Processor now discovers installed fonts automatically (from 0:/fonts)
• Icons added to the PDF Viewer toolbar
• Terminal emulator performance improvements
• Wikipedia app improvements and a simplified starting page
• Music app defaults to the user's Music folder
• Paint app UI improvements
• System Configuration renamed to Settings
• Kernel build numbering
• Licensing files added and copyright notices updated

Fixed

• Login screen no longer hangs when no USB input device is connected
• Various shell and Terminal reliability fixes, including output redirection and a white flash on launch
• Fixed audio mixer and Music app freezes, and a freeze when closing the Music app
• Reliability improvements in the Window Server and IPC subsystems
• Fixed a periodic freeze in the print stack
• Fixed desktop background selection freeze
• Process-wide spinlock added to the userspace heap for thread safety
• Fixed the VFS delete operation for the ramdisk driver
• Fixed list alignment with indent options in the Word Processor
• Fixed Screenshot full-screen flickering
• Standardized and fixed scrollbars in the Text Editor and other apps
• Corrected process and PID reporting
• Numerous additional kernel and desktop bug fixes

Included in ISO

• MontaukOS SMP kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/os/certs/ca-certificates.crt)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM Shareware game with SDL_mixer audio support
• Experimental HTTP server (httpd) and default page (0:/www/index.html)

MontaukOS 0.1.2

May 2, 2026

New

• Symmetric Multiprocessing (SMP) support
• New Time Zone Configuration applet in System Configuration with full time zone database
• Message box dialogs (OK, Yes/No, OK/Cancel) as a shared library (see Docs > Desktop Internals > Dialogs)
• Open/Save file dialogs as a shared library (see Docs > Desktop Internals > Dialogs)
• Copy and Move file operations in Files app
• Standard MTK GUI toolkit; the following apps were ported:
  • Calculator
  • Weather
  • Wikipedia
  • Bluetooth
  • Disks
  • Printers
  • Process Manager
• New formatting options added to Wikipedia
• New Screenshot app for capturing desktop images
• New Paint app
• New Video Player app with AVI format support
• Ported Lua scripting language interpreter
• Terminal app ported to Window Server from being desktop built-in app
• Terminal app now supports zoom shortcuts
• Process Manager (procmgr) ported to Window Server, UI revamped, Windows tab added
• New Word Processor app; PDF export included
• New Spreadsheet app
• Text Editor app ported to Window Server from being desktop built-in app
• Text Editor now supports C and Lua syntax highlighting
• Audio visualizer added to Music app
• New Window Server helpers for standalone GUI apps (win_create, win_poll, win_present, etc.)
• Files app now has virtual folders to expose system components (System Configuration, Apps folders)
• Drive labels displayed in Files app
• Process crash popups (CrashReport)
• Expanded ACPI support
• Primitive S3 sleep/wake support
• Support for Internet Printing Protocol (IPP) printing
• Print dialog and test page printing
• Primitive clipboard support
• ELF shared library support with PIC code model
• Login screen improvements
• PDF viewer rendering improvements
• Super + Space keyboard shortcut for desktop search panel

Included in ISO

• MontaukOS SMP kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/etc/ca-certificates.crt)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM Shareware game with SDL_mixer audio support
• Experimental HTTP server (httpd) and default page (0:/www/index.html)
• Desktop wallpaper - Lake and mountains by Stephen Walker, Unsplash

MontaukOS 0.1.1

New

• Quality of life improvements in Wikipedia Client and Image Viewer apps
• Fixed memory leaks
• Fixed ghost shell.elf process bug in terminal emulator
• Fixed File Manager rendering bug

Included in ISO

• MontaukOS kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/etc/ca-certificates.crt)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM Shareware game and Montauk DOOM runtime (0:/games/doom.elf)
• Experimental HTTP server (httpd) and default page (0:/www/index.html)
• Desktop wallpaper - Lake and mountains by Stephen Walker, Unsplash

MontaukOS 0.1.0

(first release)

Included in ISO

• MontaukOS kernel
• Userspace bootstrap (0:/os/init.elf) and other essential system utilities
• MontaukOS desktop environment and graphical apps
• Manual pages (0:/man), readable via man command
• System CA certificates (0:/etc/ca-certificates.crt)
• Flat Remix icon pack
• JetBrains Mono, Noto Serif, Roboto, and C059 Roman (open Century Schoolbook) TrueType fonts
• DOOM Shareware game and Montauk DOOM runtime (0:/games/doom.elf)
• Experimental HTTP server (httpd) and default page (0:/www/index.html)
• Desktop wallpaper - pine forest by Gustav Gullstrand, Unsplash