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.

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.

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).

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.

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

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

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.

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.

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.

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

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.

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.

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.

flyer-composer can be used to prepare one- or two-sided flyers for printing on one sheet of paper.

Imagine you have designed a flyer in A6 format and want to print it using your A4 printer. Of course, you want to print four flyers on each sheet. This is where Flyer Composer steps in, creating a PDF which holds your flyer four times. If you have a second page, Flyer Composer can arrange it the same way - even if the second page is in a separate PDF file.

This package contains both the command line tool and the gui too.

img2pdf converts images to PDF via direct JPEG inclusion. That conversion is lossless: the image embedded in the PDF has the exact same color information for every pixel as the input.

Sioyek is a PDF viewer with a focus on textbooks and research papers.

MuPDF is a C library that implements a PDF and XPS parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks.

The library ships with a rudimentary X11 viewer, and a set of command line tools for batch rendering pdfdraw, rewriting files pdfclean, and examining the file structure pdfshow.

Poppler is a PDF rendering library based on the xpdf-3.0 code base. Poppler gives access to the following binary programs:

• pdfattach

• pdfdetach

• pdffonts

• pdfimages

• pdfinfo

• pdfseparate

• pdfsig

• pdftocairo

• pdftohtml

• pdftoppm

• pdftops

• pdftotext

• pdfunite

The zathura-ps plugin adds PS support to zathura using libspectre.

Zathura is a customizable document viewer. It provides a minimalistic interface and an interface that mainly focuses on keyboard interaction.