OperaUSB

Category: Internet - Web Browsers (10)
Synopsis: Opera is a fast and secure web browser that features pop-up blocking, tabbed browsing, integrated searches, built-in email and RSS client etc. OperaUSB is a portable package for Opera that does not write to the registry nor leave any data on the guest machine where it is run.
Another alternative is Opera Portable. Thanks to TheReaper for suggesting this.
Writes settings to: Application folder
How to extract: Download the ZIP package and extract to a folder of your choice. Launch operausb.exe.
Stealth: Yes
Unicode support: Yes
License: Freeware
System Requirements: WinNT / Win2K / WinXP / Vista

download opera USB

µTorrent V1.7.7

Category: Internet - P2P Clients (5)
Synopsis: µTorrent is a small BitTorrent client that uses very little system resources. It supports multiple simultaneous downloads, smart bandwidth usage, file level priorities, configurable bandwidth scheduling, global/per-torrent upload/download rate limiting etc.
Writes settings to: Application folder
How to extract: Download the single EXE file to a folder of your choice. Create an empty file called settings.dat in the same folder so that settings will be written there. Launch utorrent.exe.
Stealth: Yes
Path portability: Requires manual entry of relative path (eg. ..\..\personal\work.doc)
Unicode support: Yes
License: Freeware
System Requirements: Win95 / Win98 / WinME / WinNT / Win2K / WinXP / Vista
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Firefox Portable V2.0.0.14

Category: Internet - Web Browsers (10)

Synopsis: Mozilla Firefox is an web browser that includes popup blocking, tabbed browsing, smart search and built-in download manager. Firefox Portable is a special build of Mozilla Firefox that is optimized for use on a USB key drive. It has some specially-selected optimizations to make it perform faster and extend the life of your USB key as well as a specialized launcher that will allow most of your favorite extensions to work as you switch computers.

Another alternative is X-Firefox.

Writes settings to: Application folder

How to extract: Download the self-extracting EXE and extract to a folder of your choice. Launch FirefoxPortable.exe.

Stealth: No

Unicode support: Partial. Firefox has problems creating local files with filenames that cannot be encoded using the current code page. For example, if your current code page is Chinese, but you are trying to save to a Korean filename, the output filename will be a bunch of underscore characters.

License: Freeware/Open Source

System Requirements: Win95 / Win98 / WinME / WinNT / Win2K / WinXP / Vista
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Yod'm 3D V1.4

Category: Productivity - Virtual Desktops (3), System - Display (23)
Synopsis: Yod'm 3D is a virtual desktop manager that uses a 3D rotating cube to visualize the change-over of desktops. It can manage up to four desktops.
Note: This app has turned payware, so I have enabled direct download for this entry.
Writes settings to: Application folder

Dependencies: DirectX 9

How to extract: Download the ZIP package and extract to a folder of your choice. Launch Yodm3D.exe
Stealth: Yes
License: Freeware

System Requirements: Win2K / WinXP / Vista

download Yod'm 3D V1.4

Process Explorer V11.20

Category: System - Task Managers (16)

Synopsis: Process Explorer is an advanced task manager. It is an indispensable tool for both beginners and power users. I use it all the time to kill tasks that refuse to be killed, or find what which processes are still holding on to a particular file or DLL so it refuses to be deleted.

Writes settings to: Windows registry

How to extract: Download the ZIP package and extract to a folder of your choice. Launch procexp.exe.

Stealth: No

Unicode support: No

License: Freeware

System Requirements: Win95 / Win98 / WinME / WinNT / Win2K / WinXP / Vista

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Portable PowerISO 3.8

PowerISO is a powerful CD/DVD image file processing tool, which allows you to open, extract, create, edit, compress, encrypt, split and convert ISO files, and mount these files with internal virtual drive. It can process almost all CD-ROM image files including ISO and BIN.
*Open and extract ISO File.
*Create ISO file from hard disk files or CD/DVD-ROM.
*Edit an existing ISO file directly.
*Convert image files between ISO/BIN and other formats. PowerISO can convert almost all image file formats to standard ISO format file.
*Make bootable ISO file, get boot information from bootable ISO file.
*Make floppy disk image file.
*Optimize files to save disk space while saving ISO file.
*Mount ISO file with internal virtual drive. You don't need install any other virtual drive software.
*Can be used easily. PowerISO supports shell integration, context menu, drag and drop, clipboard copy paste..

Download Portable PowerISO 3.8

Portable 7-Zip 4.42 R2

7-Zip is an open source file archiver with the high compression ratio predominantly for the Microsoft Windows operating system. It operates either as a command line program or with a graphical user interface. It also features integration with the Windows shell environment. 7-Zip is free software, developed by Igor Pavlov and distributed under the GNU LGPL license.

The main features of 7-Zip:
- High compression ratio in new 7z format with LZMA compression
- 7-Zip is free software distributed under the GNU LGPL
- Supported formats:
Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS
- For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip
- Self-extracting capability for 7z format
- Integration with Windows Shell
- Powerful File Manager
- Powerful command line version
- Plugin for FAR Manager
- Localizations for 65 languages

Download disini