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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.
Command shell & program launcher - for the Apple II
Davex is a ProDOS command shell & program launcher for the Apple II family of computers. It offers a *nix-like command interpreter, has intrinsic and extrinsic invokable modules, and serves as a print spooler and general I/O redirector.
...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.
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JaguiD is a Java GUI for DOS. It consists of several sub-projects including a Java Compiler, a Class Runner and a Jar Packager. JaguiD has limited Java support to provide a Graphical User Interface for DOS and compatibles.
Sinhala Desktop is a Sinhala Version of Windows Shell Replacement. This project contains all the major Windows System components with Sinhala User Interface. (Sinhala is a national language of Sri Lanka.) Developed Using Delphi 6 and C++Builder 6.
The Banana Kernel is an open-source pedagogical operating system intended to provide useful means for teaching basic OS concepts, with the possibility of interaction with external modules developed by the teacher or student.
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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.