Good documentation on 6502 CPU

Good portable z80 emulation library written in C

Excellent project to implement a BBC Micro on an FPGA with full source

Microsoft .NET Gadgeteer is a rapid prototyping platform for small electronic gadgets and embedded hardware devices.

A very small C interpreter.

This is a site for all things about amateur Unmanned Aerial Vehicles (UAVs).

cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.

Olimex, Arduino, Sparkfun, GPS, Bluetooth, PIC MCUs, ARM MCUs, programmers, debuggers and much more.

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

.NET Micro Framework enables .NET Developers to create compelling embedded applications for connected devices. The Bicycle Computer is a demonstration project that will contain a gesture based UI, multiple sensors, and Web Service connectivity.

Amarino is a toolkit to connect Android-driven mobile devices with Arduino microcontrollers via Bluetooth. The toolkit provides easy access to internal phone events which can be further processed on the Arduino open-source prototyping platform.

BeRTOS is a real time open source operating system supplied with drivers and libraries designed for the rapid development of embedded software.

QEMU is a generic and open source machine emulator and virtualizer.

When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.

When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests.

Simple .INI file parser in C, good for embedded systems

db4o is the open source object-oriented database that enables Java and .NET developers to store and retrieve any application object with only one line of code, eliminating the need to predefine or maintain a separate, rigid data model.

VirtualBreadboard is an easy to use simulation and modelling tool that can be used in place of a real breadboard for quickly performing experiments and testing out electronic and microcontroller powered 'embedded' applications. Since 1999 VirtualBreadboard has been a favourite with universities and enthusiasts from all around the world.

Metaboard is a USB based prototyping board for Atmel's AVR microcontrollers. It is designed to be (mostly) compatible with Arduino. Its entire design (hardware and firmware) is Open Source.

V-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip.

Parallel programming for tiny computers

The open-source uIP TCP/IP stack provides TCP/IP connectivity to tiny embedded 8-bit microcontrollers, with maintained interoperability and RFC standards compliance. uIP was developed by Adam Dunkels of the Networked Embedded Systems group at the Swedish Institute of Computer Science but is further developed by a world-wide team of developers.

MenuetOS is an Operating System in development for the PC written entirely in 32/64 bit assembly language. Menuet64 is released under License and Menuet32 under GPL. Menuet supports 32/64 bit x86 assembly programming for smaller, faster and less resource hungry applications.

The Uzebox is a retro-minimalist homebrew game console. It is based on an AVR 8-bit general purpose microcontroller made by Atmel. The particularity of the system is that it's based on an interrupt driven kernel and has no frame buffer. Functions such as video sync generation, tile rendering and music mixing is done realtime by a background task so games can easily be developed in C. The design goal was to be as simple as possible yet have good enough sound and graphics while leaving enough resources to implement interesting games.

C#-SQLite is an independent reimplementation of the SQLite software library version 3.6.17

Scratchbox is a cross-compilation toolkit designed to make embedded Linux application development easier. It also provides a full set of tools to integrate and cross-compile an entire Linux distribution.