Strings is usually part of the binutils and since they are maintained by the Free Software Foundation and licensed under the GNU Public License, the source code is available here:

http://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git

or packages of version related snapshots here:

ftp://sourceware.org/pub/binutils/snapshots

If you want to start with a general overview, try the Wikipedia page for binutils or this explanation of the toolchain (more a general description)

Answer from M-x on Stack Overflow
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GNU
sourceware.org › binutils › docs › binutils › strings.html
strings (GNU Binary Utilities)
Only print strings from initialized, loaded data sections in the file. This may reduce the amount of garbage in the output, but it also exposes the strings program to any security flaws that may be present in the BFD library used to scan and load sections. Strings can be configured so that this option is the default behaviour.
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GitHub
github.com › redox-os › binutils-gdb › blob › master › binutils › strings.c
binutils-gdb/binutils/strings.c at master · redox-os/binutils-gdb
Mirror of https://gitlab.redox-os.org/redox-os/binutils-gdb - binutils-gdb/binutils/strings.c at master · redox-os/binutils-gdb
Author   redox-os
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Debian Manpages
manpages.debian.org › jessie › binutils › strings(1)
strings(1) — binutils — Debian jessie — Debian Manpages
Scroll to navigation · Source file: strings.1.en.gz (from binutils 2.25-5+deb8u1) Source last updated: 2017-01-12T10:36:22Z Converted to HTML: 2019-03-13T22:05:00Z
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GNU
gnu.org › software › binutils
Binutils - GNU Project - Free Software Foundation
When a release is imminent a pre-release tarball is created in order to allow users a chance to preview the changes before they become official. These are available from here: https://sourceware.org/pub/binutils/snapshots/.
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Softpedia
linux.softpedia.com › programming › compilers › gnu binutils
GNU Binutils - Download (Linux) - Softpedia
October 15, 2019 - Installing the GNU Binutils project on your GNU/Linux operating system (32-bit and 64-bit flavors are supported at this time) is an easy task, as all you have to do is to open the built-in package manager application (e.g. Synaptic Package Manager or Ubuntu Software Center), use the ‘binutils’ search string to find it in the main software repositories and install it with a couple of mouse clicks.
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Desy
www-zeuthen.desy.de › dv › documentation › unixguide › infohtml › binutils › docs › binutils › strings.html
strings - GNU Binary Utilities
Next: strip, Previous: size, Up: Top · strings [-afovV] [-min-len] [-n min-len] [--bytes=min-len] [-t radix] [--radix=radix] [-e encoding] [--encoding=encoding] [-] [--all] [--print-file-name] [-T bfdname] [--target=bfdname] [--help] [--version] file
Find elsewhere
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Debian Manpages
manpages.debian.org › buster › binutils-common › strings.1.en.html
strings(1) — binutils-common — Debian buster — Debian Manpages
March 21, 2019 - strings [-afovV] [-min-len] [-n min-len] [--bytes=min-len] [-t radix] [--radix=radix] [-e encoding] [--encoding=encoding] [-] [--all] [--print-file-name] [-T bfdname] [--target=bfdname] [-w] [--include-all-whitespace] [-s] [--output-separatorsep_string] [--help] [--version] file... For each file given, GNU strings prints the printable character sequences that are at least 4 characters long (or the number given with the options below) and are followed by an unprintable character.
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GNU
sourceware.org › binutils › docs-2.29 › binutils › strings.html
GNU Binary Utilities: strings
Only print strings from initialized, loaded data sections in the file. This may reduce the amount of garbage in the output, but it also exposes the strings program to any security flaws that may be present in the BFD library used to scan and load sections. Strings can be configured so that this option is the default behaviour.
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GitHub
github.com › gittup › binutils
GitHub - gittup/binutils: gittup.org's binutils · GitHub
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc.
Starred by 20 users
Forked by 10 users
Languages   C 66.5% | Makefile 12.4% | Assembly 11.0% | C++ 4.4% | Scheme 1.1% | Shell 0.7%
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GitHub
github.com › skyglobe › sstrings
GitHub - skyglobe/sstrings: A simpler version of GNU binutils' strings tool. · GitHub
A simpler version of GNU binutils' strings tool. Contribute to skyglobe/sstrings development by creating an account on GitHub.
Author   skyglobe
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Foreachsam
foreachsam.github.io › book-util-binutils › book › content › command › strings
strings - binutils 使用筆記 - foreachsam
GNU strings (GNU Binutils for Ubuntu) 2.26 Copyright (C) 2015 Free Software Foundation, Inc. This program is free software; you may redistribute it under the terms of the GNU General Public License version 3 or (at your option) any later version.
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iO Flood
ioflood.com › blog › install-strings-command-linux
How to Install and Use 'Strings' Command in Linux
January 8, 2024 - The ‘strings’ command is typically ... binutils package. For Debian-based distributions like Ubuntu, use the command sudo apt-get install binutils....
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Debian Manpages
manpages.debian.org › experimental › binutils-x86-64-linux-gnu › x86_64-linux-gnu-strings.1.en.html
x86_64-linux-gnu-strings(1) — binutils-x86-64-linux-gnu — Debian experimental — Debian Manpages
June 2, 2023 - / experimental / binutils-x86-64-linux-gnu / x86_64-linux-gnu-strings(1) links · language-indep link · package tracker · raw man page · table of contents · NAME · SYNOPSIS · DESCRIPTION · OPTIONS · SEE ALSO · COPYRIGHT · other versions · trixie 2.44-3 ·
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MIT
web.mit.edu › gnu › doc › html › binutils_8.html
The GNU Binary Utilities - strings
Go to the previous, next section · strings [-afov] [-min-len] [-n min-len] [-t radix] [-] [--all] [--print-file-name] [--bytes=min-len] [--radix=radix] [--target=bfdname] [--help] [--version] file
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LinuxQuestions.org
linuxquestions.org › questions › programming-9 › 'strings'-binary-from-binutils-how-do-you-use-it-819825
'strings' binary from binutils - how do you use it?
Hi , it is about 'strings' binary from binutils. I recently wanted to test what it does and how it works. The best I did was this: Code: #!/bin/sh