This a collection of Python modules commonly associated with InfoSec.

info_sec python modules

Scapy: send, sniff and dissect and forge network packets. Usable interactively or as a library
pypcap, Pcapy and pylibpcap: several different Python bindings for libpcap
libdnet: low-level networking routines, including interface lookup and Ethernet frame transmission
dpkt: fast, simple packet creation/parsing, with definitions for the basic TCP/IP protocols
Impacket: craft and decode network packets. Includes support for higher-level protocols such as NMB and SMB
pynids: libnids wrapper offering sniffing, IP defragmentation, TCP stream reassembly and port scan detection
Dirtbags py-pcap: read pcap files without libpcap
flowgrep: grep through packet payloads using regular expressions
Knock Subdomain Scan, enumerate subdomains on a target domain through a wordlist
Mallory, extensible TCP/UDP man-in-the-middle proxy, supports modifying non-standard protocols on the fly
Pytbull: flexible IDS/IPS testing framework (shipped with more than 300 tests)

Debugging and reverse engineering

Paimei: reverse engineering framework, includes PyDBG, PIDA, pGRAPH
Immunity Debugger: scriptable GUI and command line debugger
mona.py: PyCommand for Immunity Debugger that replaces and improves on pvefindaddr
IDAPython: IDA Pro plugin that integrates the Python programming language, allowing scripts to run in IDA Pro
PyEMU: fully scriptable IA-32 emulator, useful for malware analysis
pefile: read and work with Portable Executable (aka PE) files
pydasm: Python interface to the libdasm x86 disassembling library
PyDbgEng: Python wrapper for the Microsoft Windows Debugging Engine
uhooker: intercept calls to API calls inside DLLs, and also arbitrary addresses within the executable file in memory
diStorm: disassembler library for AMD64, licensed under the BSD license
python-ptrace: debugger using ptrace (Linux, BSD and Darwin system call to trace processes) written in Python
vdb / vtrace: vtrace is a cross-platform process debugging API implemented in python, and vdb is a debugger which uses it
Androguard: reverse engineering and analysis of Android applications
Fuzzing

Sulley: fuzzer development and fuzz testing framework consisting of multiple extensible components
Peach Fuzzing Platform: extensible fuzzing framework for generation and mutation based fuzzing (v2 was written in Python)
antiparser: fuzz testing and fault injection API
TAOF, (The Art of Fuzzing) including ProxyFuzz, a man-in-the-middle non-deterministic network fuzzer
untidy: general purpose XML fuzzer
Powerfuzzer: highly automated and fully customizable web fuzzer (HTTP protocol based application fuzzer)
SMUDGE
Mistress: probe file formats on the fly and protocols with malformed data, based on pre-defined patterns
Fuzzbox: multi-codec media fuzzer
Forensic Fuzzing Tools: generate fuzzed files, fuzzed file systems, and file systems containing fuzzed files in order to test the robustness of forensics tools and examination systems
Windows IPC Fuzzing Tools: tools used to fuzz applications that use Windows Interprocess Communication mechanisms
WSBang: perform automated security testing of SOAP based web services
Construct: library for parsing and building of data structures (binary or textual). Define your data structures in a declarative manner
fuzzer.py (feliam): simple fuzzer by Felipe Andres Manzano
Fusil: Python library used to write fuzzing programs
Web

Requests: elegant and simple HTTP library, built for human beings
HTTPie: human-friendly cURL-like command line HTTP client
ProxMon: processes proxy logs and reports discovered issues
WSMap: find web service endpoints and discovery files
Twill: browse the Web from a command-line interface. Supports automated Web testing
Ghost.py: webkit web client written in Python
Windmill: web testing tool designed to let you painlessly automate and debug your web application
FunkLoad: functional and load web tester
spynner: Programmatic web browsing module for Python with Javascript/AJAX support
python-spidermonkey: bridge to the Mozilla SpiderMonkey JavaScript engine; allows for the evaluation and calling of Javascript scripts and functions
mitmproxy: SSL-capable, intercepting HTTP proxy. Console interface allows traffic flows to be inspected and edited on the fly
pathod / pathoc: pathological daemon/client for tormenting HTTP clients and servers
Forensics

Volatility: extract digital artifacts from volatile memory (RAM) samples
LibForensics: library for developing digital forensics applications
TrIDLib, identify file types from their binary signatures. Now includes Python binding
aft: Android forensic toolkit
Malware analysis

pyew: command line hexadecimal editor and disassembler, mainly to analyze malware
Exefilter: filter file formats in e-mails, web pages or files. Detects many common file formats and can remove active content
pyClamAV: add virus detection capabilities to your Python software
jsunpack-n, generic JavaScript unpacker: emulates browser functionality to detect exploits that target browser and browser plug-in vulnerabilities
yara-python: identify and classify malware samples
phoneyc: pure Python honeyclient implementation
PDF

Didier Stevens' PDF tools: analyse, identify and create PDF files (includes PDFiD, pdf-parser and make-pdf and mPDF)
Opaf: Open PDF Analysis Framework. Converts PDF to an XML tree that can be analyzed and modified.
Origapy: Python wrapper for the Origami Ruby module which sanitizes PDF files
pyPDF: pure Python PDF toolkit: extract info, spilt, merge, crop, encrypt, decrypt...
PDFMiner: extract text from PDF files
python-poppler-qt4: Python binding for the Poppler PDF library, including Qt4 support
Misc

InlineEgg: toolbox of classes for writing small assembly programs in Python
Exomind: framework for building decorated graphs and developing open-source intelligence modules and ideas, centered on social network services, search engines and instant messaging
RevHosts: enumerate virtual hosts for a given IP address
simplejson: JSON encoder/decoder, e.g. to use Google's AJAX API
PyMangle: command line tool and a python library used to create word lists for use with other penetration testing tools
Hachoir: view and edit a binary stream field by field
py-mangle: command line tool and a python library used to create word lists for use with other penetration testing tools
Other useful libraries and tools

IPython: enhanced interactive Python shell with many features for object introspection, system shell access, and its own special command system
Beautiful Soup: HTML parser optimized for screen-scraping
matplotlib: make 2D plots of arrays
Mayavi: 3D scientific data visualization and plotting
RTGraph3D: create dynamic graphs in 3D
Twisted: event-driven networking engine
Suds: lightweight SOAP client for consuming Web Services
M2Crypto: most complete OpenSSL wrapper
NetworkX: graph library (edges, nodes)
Pandas: library providing high-performance, easy-to-use data structures and data analysis tools
pyparsing: general parsing module
lxml: most feature-rich and easy-to-use library for working with XML and HTML in the Python language
Whoosh: fast, featureful full-text indexing and searching library implemented in pure Python
Pexpect: control and automate other programs, similar to Don Libes `Expect` system
Sikuli, visual technology to search and automate GUIs using screenshots. Scriptable in Jython
PyQt and PySide: Python bindings for the Qt application framework and GUI library