Web Browser

Firefox - For Windows Users 

This is a totally cool web browser, it is more secure and full of functions. Tab browsing, blocks pop-ups, fully W3C compliant and fully customizable just to name a few of its features. Click the download link below to get your own portable Firefox.

Link:

Portable Firefox's download page

Opera - For Windows Users

This is another variety of web browser that rivals the normal Internet
Explorer. It has vast functions at it's disposal such as built-in mail
client,  BitTorrent client,  RSS reader and more. Click here to view all it's features :  Opera's Features . I manage to find 2 types of Portable Opera, one is called OperaUSB and the other is OperaPortable. Below is the download page link.

Link:

OperaUSB Download Page

OperaPortable Download Page

Camino - For Mac Users

This is another product from Mozilla, it shares similar features with its twin, Firefox, such as Tab Browsing,  Secure , and Pop-ups Blocker. Please click the link below to go to the download page.

Link:

Portable Camino Download Page

Email Client

Thunderbird - For Windows And Mac Users    

This is a cool and nice substitute to the more known Windows Outlook Express. Personally, i find Thunderbird is more user friendly and not to mentioned that it is customizable. You can view all your E-mails from multiple email accounts at once (given that you have set them into Thunderbird) and it also has a build in RSS reader. Now that it is portable, you can check your email using Thunderbird from any computer.

Link:

Portable Thunderbird For Windows Users

Portable Thunderbird For Mac Users

Media Player

Media Player Classic (MPC) - For Windows Users

This media player plays almost all types of popular video compression format,  it is an all in one package, whether it is Quicktime format, Real file Format or Windows Media Format, MPC plays it all. MPC is portable by nature, so you can download the original version, and it will still functions perfectly from your portable device. Click below to grab it now:

Link:

Media Player Classic Download Page

VLC Media Player - For Windows And Mac Users    

This is another state-of-the art media player, it plays multi video compression format and just like MPC, you just need this one heck of a player to play it all.

Link:

Portable VLC Media Player for Windows

Portable VLC Media Player for Mac

BitTorrent Client

uTorrent - For Windows User

A compact BitTorrent client is what uTorrent is, despite it's small size,just under 200KB, it has a number of features under it's belt that can even surpass some BitTorrent client which are bigger in size.  Just like MPC, this torrent requires no installation, so it is portable in nature. You just need to activate it and it is set to go.

Link:

uTorrent Download Page

CD/DVD Burning Software

Deepburner - For Windows Users

A simple CD/DVD burning software, but it still can satisfy your normal CD/DVD burning requirements. It can burn data CD/DVD, Audio CDs, burn and build ISO images and finally it also supports bootable CD/DVD. Download and try it for your self.

Link:

Portable Deepburner Download Page