Section 1 of the manual describes user commands and tools, for example, file manipulation tools, shells, compilers, web browsers, file and image viewers and editors, and so on.

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aclocal-1.11
aclocal - manual page for aclocal 1.11.6
aclocal-1.16
aclocal - manual page for aclocal 1.16.5
acme-tiny
letsencrypt tiny python client
acme
Multi-platform cross assembler for 6502/6510/65816 CPU
aconnect
ALSA sequencer connection manager  
aconnectgui
FLTK based frontend for aconnect
acorn
parse JavaScript file
acorn2sfd
creates FontForge sfd files from Acorn RISCOS fonts
acpi
Shows battery status and other ACPI information
acpi_fakekey
acpi event wrapper
acpibin
ACPI binary AML file utility
acpidump
ACPI table dump utility
acpiexamples
program showing what the code examples actually do
acpiexec
ACPI AML execution and debug utility
acpihelp
ACPI help utility
acpisrc
ACPICA source code conversion utility
acpitail
Show ACPI information in a tail-like style
acpitool
a Linux ACPI client, allowing you to query or set ACPI values
acpixtract
ACPICA source code conversion utility
acpl-int32
acpl - compile a target architectures
acpl-int64
acpl - compile a target architectures
acpl-long
acpl - compile a target architectures
acpl
compile a target architectures
acr-cat
acr cat utility
acr
autoconf replacement
acronym
elvi - surfraw(1) search tools  
act
Artemis comparison tool for genome sequences  
actdiag3
generate activity-diagram image file from spec-text file
actexec
ActExec - Task automation
actiona
Actiona - Task automation
activate-devpay
create the token and certificate files for Amazon S3
activate-global-python-argcomplete
activate-global-python-argcomplete - argcomplete utility script
activitygen
Eclipse - Generates routes of persons throughout a day for the microscopic traffic simulation SUMO
acyclic
make directed graph acyclic
ada_count
generic_count - count physical lines of code, given a comment marker
adasockets-config
script to get information about the installed AdaSockets library
adb
Android Debug Bridge
add-accession-numbers
ctn_manpage - Generic CTN manual page
add-apt-repository
Adds a repository into the /etc/apt/sources.list or /etc/apt/sources.list.d or removes an existing one
add-node-component
add-node-component
add-patch
edit-patch , add-patch - tool for preparing patches for Debian source packages  
add2virtualenv
virtualenvwrapper - a set of wrappers to assist with manage your python virtualenvs   All of the commands below are to be used on the Terminal command line
addUnalignedIntervals
add_tradis_tags
check_tags - check if tr tag is present
addcr
inserts a CR (\015) before each LF (\012)
addedgeg
For each edge e, output G-e
addftinfo
add information to troff font files for use with groff
addld
Lexicon & Dictionary module creation tool for SWORD Project
addpix
AME
addr2line
convert addresses or symbol+offset into file names and line numbers
addr2name
addr2name, name2addr - perform DNS lookups from scripts
addr6
An IPv6 address analysis and manipulation tool
addressinfogenerator
HiPerConTracer Address Info Generator
addresstool
ADDRESSTOOL - Command-line utility for the Addresses framework
addrinfo
addwords
Adding words to specified dictionary collectively
adequate
Debian package quality testing tool
adf2hdf
convert from AFD to HDF5
adgnumailconverter
ADGNUMAILCONVERTER - Convert GNUMail addresses to Addresses format
adiabaticFlameT
part of OpenFOAM (The Open Source CFD Toolbox)
adiff
atool - A script for managing file archives of various types
adjointOptimisationFoam
part of OpenFOAM (The Open Source CFD Toolbox)
adjointShapeOptimizationFoam
part of OpenFOAM (The Open Source CFD Toolbox)
admesh
ADMesh - a program for processing triangulated solid meshes
admin
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux
admsCheck
Test Program for admsXml
admsXml
An automatic device model synthesizer
adnsheloex
Asynchronous-capable DNS client utilities
adnshost
Asynchronous-capable DNS client utilities
adnslogres
Asynchronous-capable DNS client utilities
adnsresfilter
Asynchronous-capable DNS client utilities
adplay
AdPlay/UNIX console-based OPL2 audio player
adplugdb
AdPlug database maintenance utility
adr
tool for working with Architecture Decision Records (ADRs)
ads
elvi - surfraw(1) search tools  
adserver
ADSERVERR - Simple address book server
adsf
a dead simple fileserver
adsh
internal helper program for apt-dater
adtrace
compute MAC/IP information of a PCAP file
advdef
AdvanceCOMP Deflate Compression Utility
advfs
create_compressed_fs, extract_compressed_fs - convert and extract a filesystem to/from a cloop volume
advi
- a DVI previewer and presenter with some eye candy effects for presentation.  
advmng
AdvanceCOMP MNG Compression Utility
advpng
AdvanceCOMP PNG Compression Utility
advzip
AdvanceCOMP ZIP Compression Utility
aec
compress or expand files
aecat
display an aewan document
aegisub-3.2
advanced subtitle editor
aemakeflic
produce an animation from an aewan document
aeolus
synthesised pipe organ emulator
aerc-search
search and filter patterns and options for aerc (1)
aerc
a pretty good email client
aesfix
Correct bit errors in an AES key schedules
aeskeyfind
Locates 128-bit and 256-bit AES keys in a captured memory image
aeskulap
OpenSource DICOM Viewer
aespasswd
Used to create and manage an AES keyfile
aespipe
AES encrypting or decrypting pipe
aevol_create
Aevol - an in silico experimental evolution platform
aevol_misc_ancestor_stats
Aevol - an in silico experimental evolution platform
aevol_misc_compute_pop_stats
aevol - an in silico experimental evolution platform