GPL-2.0-or-later — independent software & tools
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stunnel
SSL tunneling program
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sub2srt
Convert subtitles from .sub to subviewer .srt format
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swaks
SMTP command-line test tool
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swftools
SWF manipulation and generation tools
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synscan
Asynchronous half-open TCP portscanner
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sysbench
System performance benchmark tool
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sysstat
Performance monitoring tools for Linux
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takt
Text-based music programming language
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taktuk
Deploy commands to (a potentially large set of) remote nodes
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tarlz
Data compressor
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tccutil
Utility to modify the macOS Accessibility Database (TCC.db)
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tcptunnel
TCP port forwarder
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testdisk
Powerful free data recovery utility
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texi2html
Convert TeXinfo files to HTML
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texmath
Haskell library for converting LaTeX math to MathML
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tig
Text interface for Git repositories
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tiger-vnc
High-performance, platform-neutral implementation of VNC
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timedog
Lists files that were saved by a backup of the macOS Time Machine
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timidity
Software synthesizer
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tinyproxy
HTTP/HTTPS proxy for POSIX systems
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tio
Simple TTY terminal I/O application
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tnef
Microsoft MS-TNEF attachment unpacker
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tractorgen
Generates ASCII tractor art
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translate-toolkit
Toolkit for localization engineers
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trash-cli
Command-line interface to the freedesktop.org trashcan
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tree
Display directories as trees (with optional color/HTML output)
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treecc
Aspect-oriented approach to writing compilers
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tsung
Load testing for HTTP, PostgreSQL, Jabber, and others
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txt2man
Converts flat ASCII text to man page format
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txt2tags
Conversion tool to generating several file formats
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typespeed
Zap words flying across the screen by typing them correctly
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ubertooth
Host tools for Project Ubertooth
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ucl
Data compression library with small memory footprint
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ucon64
ROM backup tool and emulator's Swiss Army knife program
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unac
C library and command that removes accents from a string
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uncrustify
Source code beautifier
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universal-ctags
Maintained ctags implementation
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unpaper
Post-processing for scanned/photocopied books
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unuran
UNU.RAN - Universal Non-Uniform RANdom number generator
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upx
Compress/expand executable files
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urlscan
View/select the URLs in an email message or file
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urlview
URL extractor/launcher
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uudeview
Smart multi-file multi-part decoder
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uwsgi
Full stack for building hosting services
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valgrind
Dynamic analysis tools (memory, debug, profiling)
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vapoursynth-mvtools
Motion estimation and denoising filter for VapourSynth
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vbindiff
Visual Binary Diff
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vcdimager
(Super) video CD authoring solution
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vcprompt
Provide version control info in shell prompts
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vcsh
Config manager based on git
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vice
Versatile Commodore Emulator
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vifm
Ncurses-based file manager with vi-like keybindings
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vile
Vi Like Emacs Editor
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virt-manager
App for managing virtual machines
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visp
Visual Servoing Platform library
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vncsnapshot
Command-line utility for taking VNC snapshots
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vtclock
Text-mode fullscreen digital clock
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w-calc
Very capable calculator
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waon
Wave-to-notes transcriber
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wcstools
Tools for using World Coordinate Systems (WCS) in astronomical images