CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible. Interpreter, compiler, debugger, CLOS, MOP, FFI, Unicode, sockets, CLX. UI in English, German, French, Spanish, Dutch, Russian, and Danish.
...OS supported simple file concept
5. Security using XOR Encryption
Sources are available in sources section. See the Wiki for screen shots and how to run this OS on DOSBox / Wine environment.
VSPMS is the "Very Simple Project Management System", which is a cross-platform set of shell tools and aliases to establish and share project environment variables, aliases, documentation, and setup procedures.
The Technical Library Template Interface is a library capable of providing standardized interfaces in Creative Commons EAL-4 standards to the open source community.
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TriOS - The Object Oriented Operating System, is the next generation operating system. Fully based on object orientation, it brings unique features to programmers and end users. Basically everything in TriOS is an object, even files and programs! Enjoy!!
Lamp is a Unix-like environment that runs in a single process (via threads) on traditional Mac OS, including standard I/O, vfork/exec, a shell, perl, sockets, virtual fs with /dev and /proc, signals, and ptrace(). Runs on 68K/PPC, and on OS X as Carbon.