Aliados is a CP/M 80 emulator. Instead of emulating a machine and running some variant of CP/M on it, it emulates only the microprocessor and captures all CP/M system calls to execute natively. It does not need to create disk images, but reads and writes on the native filesystem all files that match the CP/M naming conventions.
AtariSIO is a Linux kernel driver module plus a small set of tools that implement the Atari 8-bit (400/600/800/XL/XE) computer series SIO protocol. The kernel driver handles the low-level parts and provides a simple interface for user space applications. This package contains two tools: atariserver, an Atari disk drive emulator (similar to SIO2PC or APE for MSDOS), and atarixfer, a tool to transfer disk images to/from a connected Atari disk drive.
Audiotap is a program for conversion between .TAP files and Commodore 64 tapes. It can read WAV files containing the sampled sound of a tape and convert them to .TAP files, and can generate WAV files to be recorded on a tape and used on a Commodore 64. It can also record .TAP files from the sound card and turn .TAP files into sound played to the sound card. It does not require custom-built cables, just plain audio cables connecting the sound card and a normal audio tape player/recorder.
Avrora is a set of tools for programs that run on the AVR series of microcontrollers produced by Atmel. It contains a flexible framework for simulating, analyzing, and optimizing assembly programs, and provides a clean Java API and infrastructure for experimentation, profiling, and analysis.