Migen is a Python-based tool that automates further the VLSI design process. The Migen FHDL library replaces the event-driven paradigm with the notions of combinatorial and synchronous statements, has arithmetic rules that make integers always behave like mathematical integers, and most importantly allows the design's logic to be constructed by a Python program. This last point enables hardware designers to take advantage of the richness of the Python language - object oriented programming, function parameters, generators, operator overloading, libraries, etc. - to build well organized, reusable and elegant designs.
A collection of hand-wired, homebrew processor cores made out of discrete components.
An overview of the OpenRISC architecture and how to get started using it. Briefly talks about synthesizing an FPGA bitstream, setting up a development environment, and either emulating it or running it inside an FPGA. Also covers cross compiling an OS for it.
Unicorn is a super-CPU emulator which handles multiple common processor core architectures, from x86 to Arm. Based on QEMU, written in pure C for speed and portability. Has multiple API bindings for different languages. Does just-in-time (JIT) translation of opcodes. Designed from the ground up to be thread-safe.