I've selected useful and must-have tools for CTF games and computer security competitions. Most of this tools are often indispensable during the games (especially task-based/jeopardy CTF games).
I've combined tools by categories just like in CTF games: Reverse, Steganography, Networking, Forensics, Cryptography, Scripting.
Most of tools are cross-platform, but some of them are only for Windows or Linux.
Reverse Engineering:
- GDB - http://www.gnu.org/software/gdb/download/
- IDA Pro - https://www.hex-rays.com/products/ida/support/download.shtml
- Immunity Debugger - http://debugger.immunityinc.com/
- OllyDbg - http://www.ollydbg.de/
- radare2 - http://www.radare.org/y/?p=download
- Hopper - http://www.hopperapp.com/download.html
- nm - unix/linux tool
- objdump - linux tool
- strace - linux tool
- ILSpy - http://ilspy.net/
- JD-GUI - http://jd.benow.ca/#jd-gui-overview
- FFDec - http://www.free-decompiler.com/flash/download.html
- dex2jar - http://code.google.com/p/dex2jar/
- uncompyle2 - https://github.com/wibiti/uncompyle2
- Windows:
- Linux:
- Bless - http://home.gna.org/bless/downloads.html
- wxHexEditor - http://www.wxhexeditor.org/download.php
- Exe unpackers - Unpacking Kit 2012 - http://forum.exetools.com/showthread.php?t=13610
Networking:
- Wireshark, tshark - https://www.wireshark.org/download.html
- OpenVPN - https://openvpn.net/
- OpenSSL - https://www.openssl.org/related/binaries.html
- tcpdump - http://www.tcpdump.org/
- netcat - http://netcat.sourceforge.net/
- nmap - http://nmap.org/download.html
- HTTP:
- Live HTTP - https://addons.mozilla.org/En-us/firefox/addon/live-http-headers/ (Firefox Add-on)
- Tamper Data - https://addons.mozilla.org/En-us/firefox/addon/tamper-data/ (Firefox Add-on)
- CapTipper - https://github.com/omriher/CapTipper
Steganography:
- OpenStego - http://www.openstego.info/
- OutGuess - http://www.outguess.org/download.php
- SilentEye - http://www.silenteye.org/download.html
- Steghide - http://steghide.sourceforge.net/download.php
- StegFS - http://sourceforge.net/projects/stegfs/
- pngcheck - http://www.libpng.org/pub/png/apps/pngcheck.html
- GIMP - http://www.gimp.org/downloads/
- Audacity - http://audacity.sourceforge.net/download/
- MP3Stego - http://www.petitcolas.net/steganography/mp3stego/
- ffmpeg (for video analysis) - https://www.ffmpeg.org/download.html
Forensics:
- dd - unix/linux tool
- strings - unix/linux tool
- scalpel - https://github.com/sleuthkit/scalpel
- TrID - http://mark0.net/soft-trid-e.html
- binwalk - http://binwalk.org/
- foremost - http://foremost.sourceforge.net/
- ExifTool - http://www.sno.phy.queensu.ca/~phil/exiftool/
- Digital Forensics Framework (DFF) - http://www.digital-forensic.org/download/
- Computer Aided INvestigative Environment (CAINE) Linux forensics live distribution - http://www.caine-live.net/
- The Sleuth Kit (TSK) - http://www.sleuthkit.org/sleuthkit/download.php
- Volatility - http://code.google.com/p/volatility/
Scripting / PPC (Professional Programming and Coding):
Text editors:
- Sublime Text - http://www.sublimetext.com/
- Notepad++ - http://notepad-plus-plus.org/
- vim - http://www.vim.org/
- emacs - http://www.gnu.org/software/emacs/
Crypto:
- Cryptool - https://www.cryptool.org/
- hashpump - https://github.com/bwall/HashPump
- Sage - http://www.sagemath.org/
- John the Ripper - http://www.openwall.com/john/
- xortool - https://github.com/hellman/xortool
- Online tools:
- Modules for python - pycrypto - https://www.dlitz.net/software/pycrypto/
Source: http://delimitry.blogspot.ca/2014/10/useful-tools-for-ctf.html
