The package provides an expandable variant of the LaTeX kernel command \@testopt, named \@expandable@testopt, and a more general \@expandable@ifopt, both intended for package writers. Also we have a variant of \newcommand which uses these macros to check for optional arguments.

This package provides an API for template and package developers to create dynamic color schemes for light- and dark modes. For those unaware: we refer to dark mode when a document has a dark background with a light font and to light mode if it has a dark font with a light background.

This package eases standard conforming typesetting of Japanese, for XeLaTeX.

The font (defined in Metafont) defines a single character, a black solid skull. A package is supplied to make this character available as a symbol in maths mode.

The package provides a mechanism for inputting non-ASCII text. Nowadays, the job is mostly done by the inputenc package in the LaTeX distribution.

This package provides blackboard variants of Computer Modern fonts. The fonts are distributed as Metafont source (only); LaTeX support is available with the bbm-macros package. A sample of these fonts appears in the blackboard bold sampler.

This package provides a package to typeset syntactic trees such as those used in Chomsky's generative grammar, based on a description of the structure of the tree.

This package provides LaTeX support for the symbol for the EMF in electric circuits and electrodynamics. It provides support for multiple symbols but does not provide any fonts. The fonts themselves must be acquired otherwise.

The package provides gb4e users two relative example reference commands: \Next refers to the next example in the document and \Prev refers to the previous example. No explicit label command is required.

This package provides a MetaPost package providing facilities to assist in drawing diagrams that consist of boxes, lines, and annotations. Particular support is provided for creating EXPRESS-G diagrams, for example IDEF1X, OMT, Shlaer-Mellor, and NIAM diagrams. The package may also be used to create UML and most other Box-Line-Annotation charts, but not Gantt charts directly.

This package provides a document class for streamlining document creation in LaTeX. It does not overwrite any TeX or LaTeX commands so the user could use their own macros or other commands as they wish.

extractbb is a program that exports the dimensions of an image or PDF file to a plain text format that is easily parsed by TeX. This tool is rarely run directly by users, but is frequently used by packages running on XeTeX or upTeX. This package specifically contains a Lua-based re-implementation extractbb that behaves identically to the original C-based version distributed with Dvipdfmx.

FiXme is a collaborative annotation tool for LaTeX documents. Annotating a document here refers to inserting meta-notes, that is, notes that do not belong to the document itself, but rather to its development or reviewing process. Such notes may involve things of different importance levels, ranging from simple ``fix the spelling'' flags to critical ``this paragraph is a lie'' mentions. Annotations like this should be visible during the development or reviewing phase, but should normally disappear in the final version of the document. FiXme is designed to ease and automate the process of managing collaborative annotations, by offering a set of predefined note levels and layouts, the possibility to register multiple authors, to reference annotations by listing and indexing etc.

Cascadia Code is a monospaced font by Microsoft. This package provides the Cascadia Code family of fonts with support for LaTeX and pdfLaTeX.

This package aims at an easy-to-use interface to typeset grading schemes in tabular format, in particular grading-schemes of exercises of mathematical olympiads where multiple solutions have to be graded and might offer mutual exclusive ways of receiving points.

The shapes set of macros allows drawing regular polygons; their corresponding reentrant stars in all their variations; and fractionally filled circles (useful for visually demonstrating the nature of fractions) in MetaPost.

This package offers tools to draw simple or barely complex schemes of chemical processes. The package defines several standard symbols and styles to draw process units and streams. The guiding light of the package is the UNICHIM regulation.

This package provides TikZ styles for creating special syntax diagrams known as railroad diagrams.

The bundle provides fonts for Cirth and for Tengwar. The Tengwar fonts are supported by macros in teng.tex, or by the (better documented) tengtex package.

This package provides support for the OpenType font JetBrainsMono --- so with LuaLaTeX or XeTeX, and fontspec --- with or without ligatures, and with weights versions.

This package forms parts of expl3, and contains the code used to interface with backends (drivers) across the expl3 codebase. The functions here are defined differently depending on the engine in use. As such, these are distributed separately from l3kernel to allow this code to be updated on an independent schedule.

The Lua script provides system-independent support of Japanese typesetting engines in TeXworks. As TeXworks typesetting setup does not allow for multistep processing, this script runs one of the pTeX-based programs followed by dvipdfmx.

The package provides the language definition file for support of Interlingua in Babel. This includes translations to Interlingua of standard LaTeX names (no shortcuts are provided). Interlingua itself is an auxiliary language, built from the common vocabulary of Spanish/Portuguese, English, Italian and French, with some normalisation of spelling.

This package provides a great portion of the code is borrowed from the texpower bundle, with modifications to get things working properly in both right to left and left to right modes.