DOLFIN is a computational framework for finding numerical solutions to problems described by differential equations. Numerical models in DOLFIN are constructed using general families of finite elements. Data structures are provided for discretizing the governing system on a computational mesh. A compact syntax, similar to mathematical notation, is made available for defining function spaces and expressing variational forms. Interfaces to specialized matrix solvers are provided for solving the resultant linear systems.

fenics-dolfin is part of the FEniCS project. It is the C++ user interface to the FEniCS core components and external libraries.

SUMO is a traffic simulation package designed to handle large road networks and different modes of transportation -- including road vehicles, public transport and pedestrians. Included with SUMO is a wealth of supporting tools which automate core tasks for the creation, the execution and evaluation of traffic simulations, such as network import, route calculations, visualization and emission calculation. SUMO can be enhanced with custom models and provides various APIs to remotely control the simulation.

There are various file formats available for representing unstructured meshes and mesh data. The meshio package is able to read and write mesh files in many formats and to convert files from one format to another. Formats such as cgns, h5m, gmsh, xdmf and vtk are supported. The package provides command-line tools and a collection of Python modules for programmatic use.

This package provides vehicle models used in CommonRoad benchmarks. Varying abstraction levels are used ranging from kinematic single track models to multi-body models.

s6-rc is a service manager for s6-based systems, i.e. a suite of programs that can start and stop services, both long-running daemons and one-time initialization scripts, in the proper order according to a dependency tree. It ensures that long-running daemons are supervised by the s6 infrastructure, and that one-time scripts are also run in a controlled environment.

s6-portable-utils is a set of tiny general Unix utilities, often performing well-known tasks such as cut and grep, but optimized for simplicity and small size. They were designed for embedded systems and other constrained environments, but they work everywhere.

s6-linux-utils is a set of minimalistic Linux-specific system utilities, such as mount, umount, and chroot commands, Linux uevent listeners, a devd device hotplug daemon, and more.

s6-networking is a suite of small networking utilities for Unix systems. It includes command-line client and server management, TCP access control, privilege escalation across UNIX domain sockets, IDENT protocol management and clock synchronization.

s6-linux-init is a set of minimalistic tools to create a s6-based init system, including an /sbin/init binary, on a Linux kernel.

It is meant to automate creation of scripts revolving around the use of other skarnet.org tools, especially s6, in order to provide a complete booting environment with integrated supervision and logging without having to hand-craft all the details.

s6-dns is a suite of DNS client programs and libraries for Unix systems, as an alternative to the BIND, djbdns or other DNS clients.

Execline is a (non-interactive) scripting language, separated into a parser (execlineb) and a set of commands meant to execute one another in a chain-execution fashion, storing the whole script in the argument array. It features conditional loops, getopt-style option handling, file name globbing, redirection and other shell concepts, expressed as discrete commands rather than in special syntax, minimizing runtime footprint and complexity.

s6 is a small suite of programs for UNIX, designed to allow process supervision (a.k.a. service supervision), in the line of daemontools and runit, as well as various operations on processes and daemons. It is meant to be a toolbox for low-level process and service administration, providing different sets of independent tools that can be used within or without the framework, and that can be assembled together to achieve powerful functionality with a very small amount of code.

This package provides lightweight C libraries isolating the developer from portability issues, providing a unified systems API on all platforms, including primitive data types, cryptography, and POSIX concepts like sockets and file system operations. It is used by all skarnet.org software.

Skribilo is a free document production tool that takes a structured document representation as its input and renders that document in a variety of output formats: HTML and Info for on-line browsing, and Lout and LaTeX for high-quality hard copies.

The input document can use Skribilo's markup language to provide information about the document's structure, which is similar to HTML or LaTeX and does not require expertise. Alternatively, it can use a simpler, “markup-less” format that borrows from Emacs' outline mode and from other conventions used in emails, Usenet and text.

Lastly, Skribilo provides Guile Scheme APIs.

Most is a paging text viewer. It displays the contents of a file or the output of a command on the terminal, one screenful at a time, and lets you scroll up and down to (re)view the entire text.

You can open multiple windows within most to view different files, or to inspect different parts of the same file, at the same time.

S-Lang is a multi-platform programmer's library designed to allow a developer to create robust multi-platform software. It provides facilities required by interactive applications such as display/screen management, keyboard input, keymaps, and so on. The most exciting feature of the library is the slang interpreter that may be easily embedded into a program to make it extensible. While the emphasis has always been on the embedded nature of the interpreter, it may also be used in a stand-alone fashion through the use of slsh, which is part of the S-Lang distribution.

Newt is a windowing toolkit for text mode built from the slang library. It allows color text mode applications to easily use stackable windows, push buttons, check boxes, radio buttons, lists, entry fields, labels, and displayable text. Scrollbars are supported, and forms may be nested to provide extra functionality.

Pharo aims to provide a clean and innovative Smalltalk-inspired environment. With a stable and small core system, advanced development tools, and maintained releases, the Pharo platform can be used to build and deploy mission critical applications.

GNU Smalltalk is a free implementation of the Smalltalk language. It implements the ANSI standard for the language and also includes extra classes such as ones for networking and GUI programming.

Squeak is a full-featured implementation of the Smalltalk programming language and environment based on (and largely compatible with) the original Smalltalk-80 system. Squeak has very powerful 2- and 3-D graphics, sound, video, MIDI, animation and other multimedia capabilities. It also includes a customisable framework for creating dynamic HTTP servers and interactively extensible Web sites.

SML/NJ is an implementation of the Standard ML programming language. Standard ML has many features, including type safety, polymorphism, algebraic data types with pattern matching, higher-order functions, and a sophisticated module system. It is especially well-suited for writing compilers and other language processors.

Poly/ML is a Standard ML implementation. It is fully compatible with the ML97 standard. It includes a thread library, a foreign function interface, and a symbolic debugger.

Solidity is a statically-typed curly-braces programming language designed for developing smart contracts that run on the Ethereum Virtual Machine.

This package contains code shared among all sr.ht projects.