The Open Simulation Interface is a generic interface based on Google's protocol buffers for the environmental perception of automated driving functions in virtual scenarios.

fenics is a computing platform for solving general classes of problems that involve differential equations. fenics facilitates access to efficient methods for dealing with ordinary differential equations (ODEs) and partial differential equations (PDEs). Systems of equations such as these are commonly encountered in areas of engineering, mathematics and the physical sciences. It is particularly well-suited to problems that can be solved using the Finite Element Method (FEM).

fenics is the top level of the set of packages that are developed within the FEniCS project. It provides the python user interface to the FEniCS core components and external libraries.

OpenFOAM provides a set of solvers and methods for tackling problems in the field of Computational Fluid Dynamics (CFD). It is written in C++. Governing equations such as the Navier-Stokes equations can be solved in integral form. Physical processes such as phase change, droplet transport and chemical reaction can be modelled. Numerical methods are included to deal with sharp gradients, such as those encountered in flows with shock waves and flows with gas/liquid interfaces. Large problems may be split into smaller, connected problems for efficient solution on parallel systems.

FullSWOF_2d is a numerical tool for solving the shallow water equations on structured grids. The name FullSWOF refers to the Full form of the Shallow Water equations for Overland Flow. The discretized system of equations is solved using the finite volume method. A choice of shock-capturing methods is available to locate the transition boundaries between the wet areas and the dry areas in the model. A semi-implicit method is used to advance the solution in time. The tool is typically applied to the modelling of river flooding.

The goal of pygmsh is to combine the power of Gmsh with the versatility of Python. The package generalises many of the methods and functions that comprise the Gmsh Python API. In this way the meshing of complex geometries using high-level abstractions is made possible. The package provides a Python library together with a command-line utility for mesh optimisation.

The FEniCS Form Compiler (FFC) is a compiler for finite element variational forms. From a high-level description of the form, it generates efficient low-level C++ code that can be used to assemble the corresponding discrete operator (tensor). In particular, a bilinear form may be assembled into a matrix and a linear form may be assembled into a vector. FFC may be used either from the command line (by invoking the ffc command) or as a Python module (import ffc).

FFC is part of the FEniCS Project.

Dijitso provides a core component of the FEniCS framework, namely the just-in-time compilation of C++ code that is generated from Python modules. It is called from within a C++ library, using ctypes to import the dynamic shared library directly.

As long as the compiled code can provide a simple factory function to a class implementing a predefined C++ interface, there is no limit to the complexity of that interface. Parallel support depends on the mpi4py interface.

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.

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

The Open Simulation Interface is a generic interface based on Google's protocol buffers for the environmental perception of automated driving functions in virtual scenarios.

The Unified Form Language (UFL) is a domain specific language for declaration of finite element discretizations of variational forms. More precisely, it defines a flexible interface for choosing finite element spaces and defining expressions for weak forms in a notation close to mathematical notation.

UFL is part of the FEniCS Project.

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.

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.

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-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.

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.

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.

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.

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.

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.

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.

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.