A z80 kernel and a collection of programs, tools and documentation that allows you to assemble an OS that can:
* Run on minimal and improvised machines.
* Interface through improvised means (serial, keyboard, display).
* Edit text files.
* Compile assembler source files for a wide range of MCUs and CPUs.
* Read and write from a wide range of storage devices.
* Replicate itself.
Additionally, the goal of this project is to be as self-contained as possible. With a copy of this project, a capable and creative person should be able to manage to build and install Collapse OS without external resources (i.e. internet) on a machine of her design, built from scavenged parts with low-tech tools.
Self-hosted TODO list webapp. Seems to be written in PHP, runs on ghpages.io so it probably doesn't need much in the way of resources. No database, uses Markdown files on the back end. No auth, uses .htaccess for that.