TR7 is a lightweight Scheme interpreter that implements the revision R7RS small of scheme programming language.

It is meant to be used as an embedded scripting interpreter for other programs. A lot of functionality in TR7 is included conditionally, to allow developers freedom in balancing features and footprint.

Revised^7 Report of the Algorithmic Language Scheme adapted to Texinfo format.

Chibi-Scheme is a very small library with no external dependencies intended for use as an extension and scripting language in C programs. In addition to support for lightweight VM-based threads, each VM itself runs in an isolated heap allowing multiple VMs to run simultaneously in different OS threads.

This is a R7RS Scheme implementation designed to run within a Common Lisp environment.

Loko Scheme is intended to be a platform for application and operating system development. It is written purely in Scheme and some assembler (i.e. no C code at the bottom). Both the R6RS and the R7RS standards are supported.

Gauche is a R7RS Scheme scripting engine aiming at being a handy tool that helps programmers and system administrators to write small to large scripts quickly. Quick startup, built-in system interface, native multilingual support are some of the goals. Gauche comes with a package manager/installer gauche-package which can download, compile, install and list gauche extension packages.

HOP is a multi-tier programming language for the Web 2.0 and the so-called diffuse Web. It is designed for programming interactive web applications in many fields such as multimedia (web galleries, music players, ...), ubiquitous and house automation (SmartPhones, personal appliance), mashups, office (web agendas, mail clients, ...), etc.

Owl Lisp is a simple programming language. It is intended to provide a portable system for writing standalone programs in a subjectively pleasant dialect of Lisp. It has a minimal core and runtime, purely functional operation, and support for asynchronous evaluation.

femtolisp is a scheme-like lisp implementation with a simple, elegant Scheme dialect. It is a lisp-1 with lexical scope. The core is 12 builtin special forms and 33 builtin functions.

Scheme 9 from Empty Space (S9fES) is a mature, portable, and comprehensible public-domain interpreter for R4RS Scheme offering:

• bignum arithmetics

• decimal-based real number arithmetics

• support for low-level Unix programming

• cursor addressing with Curses

• basic networking procedures

• an integrated online help system

• loads of useful library functions

Bigloo is a Scheme implementation devoted to one goal: enabling Scheme based programming style where C(++) is usually required. Bigloo attempts to make Scheme practical by offering features usually presented by traditional programming languages but not offered by Scheme and functional programming. Bigloo compiles Scheme modules. It delivers small and fast stand alone binary executables. Bigloo enables full connections between Scheme and C programs and between Scheme and Java programs.

SLIB is a portable Scheme library providing compatibility and utility functions for all standard Scheme implementations.

GNU SCM is an implementation of Scheme. This implementation includes Hobbit, a Scheme-to-C compiler, which can generate C files whose binaries can be dynamically or statically linked with a SCM executable.

STklos is a free Scheme system mostly compliant with the languages features defined in R7RS small. The aim of this implementation is to be fast as well as light. The implementation is based on an ad-hoc Virtual Machine. STklos can also be compiled as a library and embedded in an application.

Gambit consists of two main programs: gsi, the Gambit Scheme interpreter, and gsc, the Gambit Scheme compiler. The interpreter contains the complete execution and debugging environment. The compiler is the interpreter extended with the capability of generating executable files. The compiler can produce standalone executables or compiled modules which can be loaded at run time. Interpreted code and compiled code can be freely mixed.

Stalin is an aggressively optimizing whole-program compiler for Scheme that does polyvariant interprocedural flow analysis, flow-directed interprocedural escape analysis, flow-directed lightweight CPS conversion, flow-directed lightweight closure conversion, flow-directed interprocedural lifetime analysis, automatic in-lining, unboxing, and flow-directed program-specific and program-point-specific low-level representation selection and code generation.

GNU/MIT Scheme is an implementation of the Scheme programming language. It provides an interpreter, a compiler and a debugger. It also features an integrated Emacs-like editor and a large runtime library.

GNU Screen is a terminal window manager that multiplexes a single terminal between several processes. The virtual terminals each provide features such as a scroll-back buffer and a copy-and-paste mechanism. Screen then manages the different virtual terminals, allowing you to easily switch between them, to detach them from the current session, or even splitting the view to show two terminals at once.

dtach is a tiny program that emulates the detach feature of screen, allowing you to run a program in an environment that is protected from the controlling terminal and attach to it later.

abduco provides session management i.e. it allows programs to be run independently from their controlling terminal. That is, programs can be detached---run in the background---and then later reattached.

Byobu is a Japanese term for decorative, multi-panel screens that serve as folding room dividers. The Byobu software includes an enhanced profile, configuration utilities, and system status notifications for the GNU Screen window manager as well as the Tmux terminal multiplexer.

reptyr is a utility for taking an existing running program and attaching it to a new terminal. Started a long-running process over ssh, but have to leave and don't want to interrupt it? Just start a screen, use reptyr to grab it, and then kill the ssh session and head on home.

Scribus is a desktop publishing (DTP) application and can be used for many tasks; from brochure design to newspapers, magazines, newsletters and posters to technical documentation. Scribus supports professional DTP features, such as CMYK color and a color management system to soft proof images for high quality color printing, flexible PDF creation options, Encapsulated PostScript import/export and creation of four color separations, import of EPS/PS and SVG as native vector graphics, Unicode text including right to left scripts such as Arabic and Hebrew via FreeType.

Libiscsi is a client-side library to implement the iSCSI protocol that can be used to access the resources of an iSCSI target. It is fully asynchronous with regards to iSCSI commands and SCSI tasks, but a synchronous layer is also provided for ease of use for simpler applications.