What development tools do you carry on your USB drive? [closed]

I've just bought a new 4GB USB thumb drive and I'm trying to decide what to put on it. I'm thinking about one of the webserver on a stick packages, a C/C++ IDE (leaning toward Code::Blocks; had Dev-C++ on my old USB drive) and Python.

What development related tools do you carry around with you on yours?

Update

I've added categories.

IDEs

Code::Blocks Open source, cross platform C/C++ IDE

• Supports several compilers (that you must supply) but you can also download a version that includes MingW.
• (There's a FAQ question on their website explaining how to make it portable)

Codelite -- Open-source, cross platform C/C++ IDE
Eclipse -- Open-source, cross platform Java IDE
NetBeans -- Open-source, cross platform Java IDE
JCreator -- Java IDE
MSVC6 -- Microsoft's pre-.NET C/C++ environment

Languages & Compilers

Portable Python -- Interpreter for the Python programming language

• Includes SciTE (editor) and Django (web framework)

Strawberry Perl -- "A 100% Open Source CPAN-capable Perl for Windows® computer that works exactly the same as Perl everywhere else."
Py3k -- Newest version of the Python programming language
Stackless Python
Lua -- Scripting language
MinGW -- Sort of a Windows port of GCC

• "MinGW provides a complete Open Source programming tool set which is suitable for the development of native Windows programs that do not depend on any 3rd-party C runtime DLLs."

Editors

Notepad++ (after so many recommendations, I had to try it)
UltraEdit -- "text, hex, HTML, PHP, Java, Javascript, Perl, and programmer's editor."
VIM -- "highly configurable text editor built to enable efficient text editing"

• Major rival to emacs

HEdit -- Hex editor
XVI32 (Hex Editor)
e text editor -- "The Power of Textmate on Windows"
Intype text editor -- Code editor for Windows
ConTEXT -- Code and text editor
Editpad Pro -- "powerful and versatile text editor or word processor."

Discovery

Dependency Walker -- Allows you to see what DLLs a program or DLL depends on and what functions they export.
Reflector -- Allows you to look into and decompile .Net assemblies
Spy++
DbWin32 -- Lets you see Windows debug and trace messages

• Similar to DebugView

DebugView -- Lets you see Windows debug and trace messages

Web & Network

Firefox Portable (with Firebug)
OperaUSB -- Web browser
XamppLite -- Package that includes Apache, PHP, MySQL, phpMyAdmin, OpenSSL & SQLite
PuTTY -- telnet and SSH client
Wireshark -- network protocol analyzer (packet sniffer)
WinSCP -- SFTP, FTP and SCP client for Windows

Diff/Merge

SourceGear DiffMerge -- Compare two files side by side and merge if needed.
WinDiff -- File comparison tool
Winmerge -- "Open Source differencing and merging tool for Windows."

Unix-like Tools

GNU Utilities for Win32 -- Windows version of several Unix/Linux tools
Cygwin -- Port of a Unix type environment to Windows
PowerGREP -- GREP tool

Visual Studio & .NET

NUnit -- Unit testing for .NET
TestDriven.NET -- Easily run your unit tests from Visual Studio
AnkSVN -- Subversion plugin for Visual Studio
LINQPad -- Tool to interactively develop Linq queries.

• "lets you interactively query SQL databases in a modern query language: LINQ"

Regular Expression Tools

Expresso -- Regular Expression tool
RegexBuddy -- Regular Expression tool

Misc

The Sysinterals Suite (includes DebugView, Process Explorer, & more)
WinZip
DosHere
7-zip -- Open source file archiver
Scrollbar fix for VB6
puretext -- Paste w/ formatting removed
VirtualBox -- Open source virtualization product.

• Similar to VMWare or VirtualPC

Solution 1:

Assuming a Windows Machine:

• WinMerge
• Notepad++

Solution 2:

Sysinternals tools

Solution 3:

I use a 16GB USB-Stick (larger volumes are available) as a Linux-system, that contains my complete work-environment. Every computer I use boot from this drive into my system.

Solution 4:

I like PortableApps. I use NotePad++, OpenOffice applications, etc.

Solution 5:

I recommend .NET Reflector