I stumbled upon a various collection of nice tools that all have something in common; they can be launched as stand alone executables which don't need to be installed, so ideal to carry around on your USB pen.
All are free for personal use.
Enjoy
A43 File Management Utility
A43 File Management Utility is a standalone file manager with built-in zip compression, RAR file extraction and text editing. You can easily create or open zip files by simply dragging them onto an icon, or create self-extracting exe files in the same manner. In addition A43 allows you to keep a list of favorite folders, change file dates, search for files and edit files via the built-in editor. The program does not require an installation.

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Country Codes
Country Codes is a small database of country codes and additional information for more than 250 countries. It displays their location (continent), ISO 3166-1 Alpha 2-3 codes and ISO number as well as IDDD (International Direct Distance Dialing) country code and flag, FIPS PUB 10-4 and TLD (Top Level Domain) code and the current time in the country. The program provides checkboxes, that allow you to copy all or just selected information to the clipboard. In addition, it provides IP to country conversion, and a handy link for each country that launches your browser with detailed information from the Internet. You can also view the location of a selected country on a world map.
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cPicture LE
cPicture LE is a software to view and work with your digital photos. It offers support for thumbnail browsing, EXIF display, histogram view, as well as various features to resize, rotate, crop and more. You can also remove red-eye effects, create a HTML gallery or picture index, and batch process images to perform selected operations on multiple photos at once. The program supports all popular images formats, and even view/convert various RAW formats as well (including Canon CR2), which is not often found in free image viewers. The interface is easy to use and provides access to the features with non-technical commands (I want to ...) and a modern look. cPicture LE offers several other handy features like mouseover image zooms, lossless rotation, image slideshow, command line options, color profile support and more. The program comes as standalone executable, and does not require installation - it can be run from a USB drive.

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Drive Manager
Drive Manager is a small and useful tool that makes it easy to retrieve drive information for all your drives at a glance. It runs as a standalone EXE file and displays Label, Type, Size, Used, Available, Format, Serial number and Percentage free for each local and removable drive. The information is refreshed every 20 seconds - double-clicking opens the drive in Windows Explorer. Drive Manager also allows you to create a substitute drive letter for a local folder, and to hide drives from Windows Explorer.

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FollowMeIP Lite
FollowMeIP Lite is a plain and simple tool that displays your external IP address, even if you are behind a router or firewall. No install needed, just run the file and it will display the IP address. It can also be minimized to the system tray.

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FTP Wanderer
FTP Wanderer is multi-threaded FTP browser, that allows you to browse and upload and download files from and to FTP sites. It features drag and drop upload/download, folder transfers, simultaneous connections, CERN proxy support, remote folder bookmarks, and resume support. The program is easy to use with an Explorer-style interface. FTP Wanderer is primarily designed for fast FTP browsing of file sites, and not for web site management. Standalone program, no install needed.

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HTTP File Server (HFS)
HTTP File Server (HFS) is an easy to use drag and drop file server for personal file sharing. It runs as a standalone executable and does not require any installation. The program is very easy to use, just drag a file into it to share it with the world. You can customize the port it is running on, specify the IP address and monitor connections from the tray icon. HFS presents the shared files on a simple HTML page, that includes the file name and size. With some HTML knowledge, you can completely customize the HTML template to meet your preference. HFS can also integrate into Windows Explorer, allowing you to easily share files from the right-click menu.

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Omziff
Omziff is a standalone encryption and security utility, that allows you to encrypt/decrypt a file, using several well known encryption algorithms, including Blowfish, Cast128, Gost, IDEA, Misty1, Rijndael, and Twofish. The program also includes a password generator, a file shredder, file splitter and several other small tools. Omziff is a standalone executable and can also be used from an USB drive or similar portable media.

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Qm - The Quick Mailer
Qm is a tiny program for sending quick e-mail messages without having to load your main email client program. It features MIME attachment support, multiple authentication methods, SMTP logging and more.

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Quick `n Easy FTP Server Lite
Quick `n Easy FTP Server Lite is a standalone, multi threaded FTP server that offers advanced features and security. The interface is simple and intuitive, with organized sections for managing users, configuration and security settings. It supports all basic FTP commands as well as virtual directories, IP blocking, server statistics and remote administration. The server can be easily set up by inexperienced users, but also offers advanced administration options. Amazingly small, at less than 400kb.

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SmartSniff
SmartSniff is a TCP/IP packet capture program that allows you to inspect network traffic that passes through your network adapter. The two pane interface displays the captured packet and detailed information in ASCII or Hex view below. Additional features include color coding of local and remote traffic, export to HTML and more. SmartSniff can use in Windows 2000/XP Raw Sockets or WinPcap for other versions of Windows. A basic, but very small and standalone protocol analyzer.

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StartupList
StartupList creates a list off all items that are in any way related to your computer startup and are executed without any user interactions. It is not limited to the common Startup folders, but includes dozens of registry locations, as well as scheduled jobs, pending file operations and more. It also displays common Hijack points like browser default pages, Hosts file entries, Winsock layers, stopped and disabled services and much more. StartupList requires some technical knowledge and is not intended for the complete novice. It does not allow you to delete or disable any items, but provides links to the registry keys via RegEdit.

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TreePad Lite
TreePad is an intuitive and powerful personal database program, PIM and personal data search engine. It allows you to store all your notes, emails, texts, hyperlinks, etc. into a single file. With the look and feel of the familiar Windows explorer, editing, storing, browsing, searching and retrieving your data can not be easier! TreePad can be run directly from a USB stick, including data. To find any article you previously created or imported, you can browse the tree, in the same way as you browse directories/folders in the Windows explorer. Alternatively, you can use the very fast internal search engine to instantly find any item you need!

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WhoisThisDomain
WhoisThisDomain enables you to view owner and registration information for any domain name. It supports generic domains as well as country code domains, and you can look up multiple domain names at once by pasting the domain names or URLs into the input window. The results can be saved to text files or exported as HTML report. Standalone program, no install needed.

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WinAudit
WinAudit allows you to perform a detailed audit of the hardware and software configuration of your computer. The resulting audit report contains details on installed software, license information, peripherals, memory usage, processor model, network settings, startup programs and more. It can be viewed from within the application, or optionally exported to text, nicely formatted web page, XML and spreadsheet formats, or sent by email. WinAudit also supports ODBC connections and can export audit data to an existing database. Very small, standalone program that works well.

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YamiPod
YamiPod allows you to manage the content of your iPod without the need to have iTunes installed. You can copy mp3 and AAC files to/from your iPod, import and export playlists, search for songs, remove duplicates, create and edit notes and much more. The program runs completely standalone and can be copied directly to your iPod and run from there. Other features include a built-in music player, lyrics support, iPod information display (owner, serial used space etc.), adding and editing of notes and more.

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