Lemon OS is a UNIX-like 64-bit operating system written in C++.

About Lemon OS

Lemon OS includes its own modular kernel with SMP and networking, window server/compositor and userspace applications as well as a collection of software ports.

If you have any questions or concerns feel free to open a GitHub issue, join our Discord server or email me at computerfido@gmail.com.

Website

Discord Server

Building Lemon OS

Prebuilt Image

Nightly Images

Before running See System Requirements

\ More screenshots

Features

• Modular Kernel
• Symmetric Multiprocessing (SMP)
• UNIX/BSD Sockets
• Network Stack (UDP, TCP, DHCP)
• A small HTTP client/downloader called steal
• Window Manager/Server LemonWM
• Terminal Emulator
• Writable Ext2 Filesystem
• IDE, AHCI and NVMe Driver
• Dynamic Linking
• mlibc C Library Port
• LLVM/Clang Port
• DOOM Port
• Audio Player (using ffmpeg)

Work In Progress

• XHCI Driver
• Intel HD Audio Driver

Third Party

Lemon OS depends on: mlibc, Freetype, zlib, libressl, ffmpeg, libfmt, libjpeg-turbo and libpng.

Optional ports include LLVM/Clang, DOOM, Binutils and Python 3.8

Various background images are located here

System requirements

• 256 MB RAM (512 is more optimal)
• x86_64 Processor supporting x86_64-v2 instructions including SSE4.2
  • For QEMU/KVM use -cpu host or at least -cpu Nehalem see this page
• 2 or more CPU cores recommended
• I/O APIC
• ATA, NVMe or AHCI disk (AHCI strongly recommended)

For QEMU run with: \ qemu-system-x86_64 Lemon.img --enable-kvm -cpu host -M q35 -smp 2 -m 1G -netdev user,id=net0 -device e1000,netdev=net0 -device ac97 \ KVM is strongly recommended

Repo Structure