Patchwork is a patch tracking system. It takes in emails containing patches, and displays the patches along with comments and state information. Users can login allowing them to change the state of patches.

GNU Wdiff is a front-end to the diff program from Diffutils that allows you to compare files on a word-by-word basis, where a word is anything between whitespace.

Visual Binary Diff (vbindiff) displays files in hexadecimal and ASCII (or EBCDIC). It can also display two files at once, and highlight the differences between them. It works well with large files (up to 4 GiB).

pwclient is a VCS-agnostic tool for interacting with Patchwork, the web-based patch tracking system.

wiggle attempts to apply patches to a target file even if the patches do not match perfectly.

Coccinelle is a tool that allows modification of C code using semantic patches in the SmPL for specifying desired matches and transformations in the C code.

E9Patch is a static binary rewriting tool for x86-64 ELF binaries, both executables and shared objects. The patched binaries can be used in place of the original, without requiring additional runtime dependencies. Binary patches can be defined through a high-level interface, which focuses on ease of use, or low-level interfaces, which provide additional flexibility and allow optimizations for performance.

Colordiff is Perl script wrapper on top of diff command which provides 'syntax highlighting' for various patch formats.

Meld is a visual diff and merge tool targeted at developers. Meld helps you compare files, directories, and version controlled projects. It provides two- and three-way comparison of both files and directories, and has support for many popular version control systems.

Meld helps you review code changes and understand patches. It might even help you to figure out what is going on in that merge you keep avoiding.

Patchutils is a collection of programs that can manipulate patch files in useful ways such as interpolating between two pre-patches, combining two incremental patches, fixing line numbers in hand-edited patches, and simply listing the files modified by a patch.

Quilt allows you to easily manage large numbers of patches by keeping track of the changes each patch makes. Patches can be applied, un-applied, refreshed, and more.

Patool provides a unified command line interface for a plethora of archivers. It supports the following archive formats natively:

• TAR (.tar, .cbt)

• BZIP2 (.bz2)

• GZIP (.gz)

• ZIP (zip, .jar, .cbz).

The archive formats below are also supported as long as the corresponding compressor or archiver commands are available:

• 7z (.7z, .cb7)

• ACE (.ace, .cba)

• ADF (.adf)

• ALZIP (.alz)

• APE (.ape)

• AR (.a)

• ARC (.arc)

• ARJ (.arj)

• CAB (.cab)

• COMPRESS (.Z)

• CPIO (.cpio)

• DEB (.deb)

• DMS (.dms)

• FLAC (.flac)

• GZIP (.gz)

• ISO (.iso)

• LRZIP (.lrz)

• LZH (.lha, .lzh)

• LZIP (.lz)

• LZMA (.lzma)

• LZOP (.lzo)

• RPM (.rpm)

• RAR (.rar, .cbr)

• RZIP (.rz)

• SHN (.shn)

• TAR (.tar, .cbt)

• XZ (.xz)

• ZOO (.zoo).

hwdata contains various hardware identification and configuration data, such as the pci.ids and usb.ids databases. Each database is contained in a specific package output, such as the pci output for pci.ids, the usb output for usb.ids, etc.

The PCI Utilities are a collection of programs for inspecting and manipulating configuration of PCI devices, all based on a common portable library libpci which offers access to the PCI configuration space on a variety of operating systems. This includes the lspci and setpci commands.

The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API, as well as a set of wrapper functions that correspond to the POSIX regular expression API.

The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API, as well as a set of wrapper functions that correspond to the POSIX regular expression API.

pdfpc is a presentation viewer application which uses multi-monitor output to provide meta information to the speaker during the presentation. It is able to show a normal presentation window on one screen, while showing a more sophisticated overview on the other one providing information like a picture of the next slide, as well as the left over time till the end of the presentation. The input files processed by pdfpc are PDF documents.

This package provides Python bindings for the Qt5 interface of the Poppler PDF rendering library.

pdf.tocgen is a set of command-line tools for automatically extracting and generating the table of contents of a PDF file. It uses the embedded font attributes and position of headings to deduce the basic outline of a PDF file.

It works best for PDF files produced from a TeX document, but it's designed to work with any software-generated PDF files (i.e. you shouldn't expect it to work with scanned PDFs). Some examples include troff/groff, Adobe InDesign, LibreOffice Writer, and probably more.

unpaper is a post-processing tool for scanned sheets of paper, especially for book pages that have been scanned from previously created photocopies.

Its main purpose is to make scanned book pages better readable on screen after conversion to PDF. Additionally, unpaper might be useful to enhance the quality of scanned pages before performing OCR.

Pdfgrep searches in pdf files for strings matching a regular expression. Support some GNU grep options as file name output, page number output, optional case insensitivity, count occurrences, color highlights and search in multiple files.

A4PDF is a low-level library for generating PDF files. It does not have a document model and instead uses PDF primitives directly. It uses LittleCMS for color management but otherwise does not convert data in any way.

QPDF is a command-line program that does structural, content-preserving transformations on PDF files. It could have been called something like pdf-to-pdf. It includes support for merging and splitting PDFs and to manipulate the list of pages in a PDF file. It is not a PDF viewer or a program capable of converting PDF into other formats.

The zathura-djvu plugin adds DjVu support to zathura using the DjVuLibre library.